-
question_answer1)
Which one of the following is a base analogue [BHU 1984]
A)
Nitrous acid done
clear
B)
Colchicine done
clear
C)
5 - bromouracil done
clear
D)
Caffeine done
clear
View Solution play_arrow
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question_answer2)
Isolation and purification of specific DNA segment from a living organism was achieved by [CBSE PMT 1993]
A)
Crick done
clear
B)
Nirenberg done
clear
C)
Khorana done
clear
D)
Beckwith and his colleagues done
clear
View Solution play_arrow
-
question_answer3)
Cyclic adenosine monophosphate was discovered by [DPMT 1993]
A)
Bekhor et al done
clear
B)
E.W. Sutherland done
clear
C)
Beerman done
clear
D)
Weismann done
clear
View Solution play_arrow
-
question_answer4)
Clover leaf model of tRNA has
A)
Acceptor arm and C arm done
clear
B)
Anticodon arm done
clear
C)
D arm done
clear
D)
All the above done
clear
View Solution play_arrow
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question_answer5)
Micrococcas nuclease enzyme
A)
Cuts the DNA from a specific site done
clear
B)
Joins the DNA segment done
clear
C)
Cuts the DNA at the junction between nucleosome done
clear
D)
Binds the DNA with histone done
clear
View Solution play_arrow
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question_answer6)
The mean diameter of DNA double helix is
A)
\[20\overset{\text{o}}{\mathop{\text{A}}}\,\] done
clear
B)
\[3.4\overset{\text{o}}{\mathop{\text{A}}}\,\] done
clear
C)
\[4.5\overset{\text{o}}{\mathop{\text{A}}}\,\] done
clear
D)
\[10\overset{\text{o}}{\mathop{\text{A}}}\,\] done
clear
View Solution play_arrow
-
question_answer7)
If an isolated strain of DNA is kept at\[82-90{}^\circ C\], then [CPMT 1991, 95]
A)
It changes into RNA done
clear
B)
It divides into one million pieces done
clear
C)
No effect done
clear
D)
It uncoils into helixes done
clear
View Solution play_arrow
-
question_answer8)
The length of a helix of DNA is
A)
\[10\overset{o}{\mathop{A}}\,\] done
clear
B)
\[20\overset{o}{\mathop{A}}\,\] done
clear
C)
\[30\overset{o}{\mathop{A}}\,\] done
clear
D)
\[34\overset{o}{\mathop{A}}\,\] done
clear
View Solution play_arrow
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question_answer9)
Which site of a t-RNA molecule hydrogen bonds to a m-RNA molecule [MP PMT 1993, 2002]
A)
Codon done
clear
B)
Anticodon done
clear
C)
5¢ end of the t-RNA molecule done
clear
D)
3¢ end of the t-RNA molecule done
clear
View Solution play_arrow
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question_answer10)
How many types of ribonucleic acids are known
A)
One type done
clear
B)
Two types done
clear
C)
Three types done
clear
D)
Four types done
clear
View Solution play_arrow
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question_answer11)
The element absent in RNA is [AMU 2005]
A)
Nitrogen done
clear
B)
Sulpher done
clear
C)
Oxygen done
clear
D)
Hydrogen done
clear
View Solution play_arrow
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question_answer12)
Who was awarded Nobel Prize for synthesis of RNA in 1959 [BVP 2003]
A)
S. Ochoa done
clear
B)
A. Kornberg done
clear
C)
H. Khorana done
clear
D)
Nirenberg done
clear
View Solution play_arrow
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question_answer13)
Breakthrough of the year 2002 [Kerala CET 2003]
A)
cDNA done
clear
B)
16 SrRNA done
clear
C)
rDNA done
clear
D)
miRNA done
clear
View Solution play_arrow
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question_answer14)
Uridine monophosphate is found in [Kerala CET 2002]
A)
Centrosome done
clear
B)
Lysosome done
clear
C)
Cell wall done
clear
D)
RNA done
clear
View Solution play_arrow
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question_answer15)
Franklin and Wilkins showed that DNA [DPMT 1993]
A)
Contains four bases done
clear
B)
Is a helix done
clear
C)
Has equal amount of adenine and thymine done
clear
D)
Is made up of nucleotides done
clear
View Solution play_arrow
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question_answer16)
Feulgen reaction is a special test for [BHU 1983; AFMC 1983; CPMT 1985; MP PMT 2000]
A)
RNA done
clear
B)
DNA done
clear
C)
Protein done
clear
D)
Carbohydrate done
clear
View Solution play_arrow
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question_answer17)
Which one of the following is not a process of DNA replication
A)
Palindromic done
clear
B)
Dispersive done
clear
C)
Conservative done
clear
D)
Semiconservative done
clear
View Solution play_arrow
-
question_answer18)
In which type of DNA replication of the two newly formed molecules one is purely a new one and the other one is old
A)
Conservative done
clear
B)
Semiconservative done
clear
C)
Dispersive done
clear
D)
Both (a) and (b) done
clear
View Solution play_arrow
-
question_answer19)
Semiconservative model of DNA replication was proposed by which workers in eukaryotes [MP PMT 1994, 96]
A)
Taylor, Woods and Hughes done
clear
B)
Messelson and Stahl done
clear
C)
Nirenberg and Khorana done
clear
D)
Watson and Crick done
clear
View Solution play_arrow
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question_answer20)
For providing evidence in favour of semiconservative way of DNA replication; Taylor, Woods and Hughes performed experiments on
A)
Drosophila done
clear
B)
Pisum sativum done
clear
C)
Allium sepa done
clear
D)
Vicia faba done
clear
View Solution play_arrow
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question_answer21)
Process of DNA replication is effected by an enzyme called
A)
Ligase done
clear
B)
Mutase done
clear
C)
Ribonuclease done
clear
D)
Polymerase I done
clear
View Solution play_arrow
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question_answer22)
Which one of the following is called polynucleotide joining enzyme [CBSE PMT 2002]
A)
Polymerase I done
clear
B)
Polymerase II done
clear
C)
Ligase done
clear
D)
Ribonuclease done
clear
View Solution play_arrow
-
question_answer23)
Who first suggested bidirection DNA replication process
A)
M. Masters done
clear
B)
P. Broda done
clear
C)
(a) and (b) both done
clear
D)
Meselson done
clear
View Solution play_arrow
-
question_answer24)
Who used heavy nitrogen N15 for proving semiconservative way of DNA replication [MP PMT 1993]
A)
Masters and Broda done
clear
B)
Meselson and Stahl done
clear
C)
Watson and Crick done
clear
D)
Jacob and Monad done
clear
View Solution play_arrow
-
question_answer25)
Which form of RNA is most heterogeneous [Haryana PMT 2005]
A)
tRNA done
clear
B)
mRNA done
clear
C)
rRNA done
clear
D)
hnRNA done
clear
View Solution play_arrow
-
question_answer26)
The name "mRNA'' was given by
A)
Kornberg and Khorana done
clear
B)
Khorana and Nirenberg done
clear
C)
Jacob and Monad done
clear
D)
Messelson and Stahl done
clear
View Solution play_arrow
-
question_answer27)
In eukaryotes mRNA transcribed is called
A)
Heterogenous nuclear RNA done
clear
B)
tRNA done
clear
C)
Genetic RNA done
clear
D)
None of the above done
clear
View Solution play_arrow
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question_answer28)
Life span of mRNA in E. coli is
A)
Less than one minute done
clear
B)
2 minutes done
clear
C)
Five minutes done
clear
D)
More than 10 minutes done
clear
View Solution play_arrow
-
question_answer29)
Average life span of mRNA in eukaryotes is
A)
5 minutes done
clear
B)
10 minutes done
clear
C)
30 minutes done
clear
D)
More than one hour done
clear
View Solution play_arrow
-
question_answer30)
In which form of RNA most nucleotides are in modified form
A)
mRNA done
clear
B)
rRNA done
clear
C)
tRNA done
clear
D)
hnRNA done
clear
View Solution play_arrow
-
question_answer31)
On which part of tRNA, amino acid gets linked
A)
Anticodon loop done
clear
B)
Variable loop done
clear
C)
3¢ end done
clear
D)
5¢ end done
clear
View Solution play_arrow
-
question_answer32)
Enzyme aminoacyl synthetase is responsible for
A)
Initiating mRNA synthesis done
clear
B)
Charging tRNA molecules done
clear
C)
Combining tRNA at P site of mRNA done
clear
D)
None of the above done
clear
View Solution play_arrow
-
question_answer33)
Which enzyme is responsible for linking the fragments of DNA [CBSE PMT 1996]
A)
DNA polymerase III done
clear
B)
Endonuclease done
clear
C)
DNA polymerase I done
clear
D)
DNA ligase done
clear
View Solution play_arrow
-
question_answer34)
A DNA molecule in which both strands have radioactive thymidine is allowed to duplicate in an environment containing non-radioactive thymidine. What will be the correct number of DNA molecules that contain some radioactive thymidine after three duplications [AIIMS 1980; DPMT 1993]
A)
There will be four such molecules done
clear
B)
There will be eight such molecules done
clear
C)
There will be only one such molecule done
clear
D)
There will be two such molecules done
clear
View Solution play_arrow
-
question_answer35)
DNA polymerase helps in [BHU 1987; CPMT 2003]
A)
Joining bits of DNA done
clear
B)
Splitting or separation of two strands of DNA done
clear
C)
Renaturation done
clear
D)
Denaturation done
clear
View Solution play_arrow
-
question_answer36)
Which one of the following ratio is constant in DNAs of different species [AIIMS 1986]
A)
A + T / C + G done
clear
B)
A + G / T + C done
clear
C)
A + C / U + G done
clear
D)
A + U / C + G done
clear
View Solution play_arrow
-
question_answer37)
Histone occupies the major grooves of DNA at an angle of [CPMT 1984; CBSE PMT 2002]
A)
\[{{15}^{o}}\] done
clear
B)
\[{{90}^{o}}\] done
clear
C)
\[{{45}^{o}}\]to the helix axis done
clear
D)
\[{{30}^{o}}\]to the helix axis done
clear
View Solution play_arrow
-
question_answer38)
Synthesis of DNA takes place by [CPMT 1989, 2003]
A)
Transduction done
clear
B)
Transcription done
clear
C)
Transformation done
clear
D)
Replication done
clear
View Solution play_arrow
-
question_answer39)
Chemically DNA differs from RNA in having [Bihar MDAT 1992; CPMT 1996, 2003; Pb. PMT 2000; MP PMT 1998, 2001; J&K CET 2005]
A)
Thymine in place of uracil done
clear
B)
Single strand done
clear
C)
Ribose sugar instead of deoxyribose sugar done
clear
D)
All of the above done
clear
View Solution play_arrow
-
question_answer40)
The carrier of genetic information is [DPMT 1991]
A)
DNA done
clear
B)
Ribosomal RNA done
clear
C)
Ribosomes done
clear
D)
Transfer RNA done
clear
View Solution play_arrow
-
question_answer41)
DNA is found primarily [AMU 1990]
A)
In cell nucleus done
clear
B)
Outside the cell nucleus done
clear
C)
In cell cytoplasm done
clear
D)
None of these done
clear
View Solution play_arrow
-
question_answer42)
The one which is capable of self-replication is [CPMT 1993; CMC Vellore 1994]
A)
DNA done
clear
B)
RNA done
clear
C)
Enzyme done
clear
D)
Protein done
clear
View Solution play_arrow
-
question_answer43)
Which one of the following pair is correctly matched [MP PMT 1993]
A)
Frederick Griffith Discovered the phenomenon of transformation done
clear
B)
Linus Pauling Isolated the DNA for the first time done
clear
C)
Francis Crick Proposed one gene one polypeptide hypothesis done
clear
D)
George Beadle Proposed the concept of inborn errors done
clear
View Solution play_arrow
-
question_answer44)
Match the following and mark the correct option Column A Column B (i) Oncogenes (1) Causes AIDS (ii) Single circular DNA (2) Lac-Operon concept (iii) Splicing (3) Component of bacterial chromosome (iv) Jacob and Monad (4) Processing of mRNA molecules (5) When activated cause cancer (i) (ii) (iii) (iv)
A)
(5) (4) (1) (2) done
clear
B)
(5) (3) (4) (1) done
clear
C)
(5) (3) (4) (2) done
clear
D)
(1) (3) (4) (2) done
clear
View Solution play_arrow
-
question_answer45)
Catalytic property of RNA was discovered by
A)
Altmann and Bend done
clear
B)
Ochoa and Korenberg done
clear
C)
Altmann and Cock done
clear
D)
Fuelgen and Beherence done
clear
View Solution play_arrow
-
question_answer46)
A model that relates repetitive DNA sequences and their transcripts of regulation in eukaryotes was proposed by
A)
Jacob and Monad done
clear
B)
Britton and Davidson done
clear
C)
Nilsson Ehle done
clear
D)
H.J. Muller done
clear
View Solution play_arrow
-
question_answer47)
Who among the following scientists developed cytochemical technique for the presence of DNA
A)
Johannsen done
clear
B)
Feulgen and Rossenbeck done
clear
C)
McClintock done
clear
D)
M.H.F. Wilkins done
clear
View Solution play_arrow
-
question_answer48)
Replication of DNA is in [Pb. PMT 1999; MP PMT 2001; Haryana PMT 2005]
A)
\[3'\to 5'\]direction done
clear
B)
\[2'\to 5'\]direction done
clear
C)
Both \[3'\to 5'\]direction and \[5'\to '\]direction done
clear
D)
None of these done
clear
View Solution play_arrow
-
question_answer49)
DNA replication is aided by [AFMC 1995; BCECE 2005]
A)
DNA polymerase only done
clear
B)
DNA ligase only done
clear
C)
Both DNA polymerase and ligase done
clear
D)
RNA polymerase done
clear
View Solution play_arrow
-
question_answer50)
If the DNA codons are ATG ATG ATG and a cytosine base is inserted at the beginning, which of the following will result [CBSE PMT 1995]
A)
A non-sense mutation done
clear
B)
CA TGA TGA TG done
clear
C)
CAT GAT GAT G done
clear
D)
C ATG ATG ATG done
clear
View Solution play_arrow
-
question_answer51)
Adenine is 30% then what would be the % of guanine [Haryana PMT 2005]
A)
10% done
clear
B)
20% done
clear
C)
30% done
clear
D)
40% done
clear
View Solution play_arrow
-
question_answer52)
Okazaki fragments are joined in 3 correct sequence by [Kerala PMT 2005]
A)
DNA polymerase done
clear
B)
DNA ligase done
clear
C)
RNA polymerase done
clear
D)
Primase (e) Helicase done
clear
View Solution play_arrow
-
question_answer53)
Ribozyme is [BHU 1995]
A)
RNA without sugar done
clear
B)
RNA without phosphate done
clear
C)
RNA having enzymic activity done
clear
D)
RNA with extra phosphate done
clear
View Solution play_arrow
-
question_answer54)
If the DNA strand has the nitrogenous base sequence ATTGCC, the mRNA will have [Manipal 1995; DPMT 2003; Kerala 2004]
A)
ATTGCA done
clear
B)
ATCGCC done
clear
C)
UGGACC done
clear
D)
UAACGG done
clear
View Solution play_arrow
-
question_answer55)
DNA is methylated at [Orissa JEE 2005]
A)
A-residue done
clear
B)
G-residue done
clear
C)
T-residue done
clear
D)
C-residue done
clear
View Solution play_arrow
-
question_answer56)
Purines of DNA are represented by [CPMT 1980; MP PMT 1986; CBSE PMT 1996; J&K CET 2002]
A)
Uracil and thymine done
clear
B)
Guanine and adenine done
clear
C)
Uracil and cytocine done
clear
D)
Thymine and cytocine done
clear
View Solution play_arrow
-
question_answer57)
A nucleoside differs from a nucleotide in not having [MP PMT 1995; J&K CET 2002]
A)
Phosphate done
clear
B)
Sugar done
clear
C)
Nitrogen base done
clear
D)
Phosphate and sugar done
clear
View Solution play_arrow
-
question_answer58)
Watson and Crick are known for their discovery that DNA [CPMT 1979; BHU 1980; DPMT 1983; MP PMT 1995; J&K CET 2002; BVP 2004]
A)
Is a single stranded helix done
clear
B)
Contains deoxyribose only done
clear
C)
Is a double stranded helix done
clear
D)
Synthesizes rRNA done
clear
View Solution play_arrow
-
question_answer59)
If the base sequence in one polynucleotide series of DNA is G-C-A-T-G, what shall be the sequence in the replicated complementary strand [MP PMT 1995]
A)
G-C-A-T-G done
clear
B)
C-G-T-A-C done
clear
C)
A-T-G-C-G done
clear
D)
G-C-A-T-C done
clear
View Solution play_arrow
-
question_answer60)
Phosphorus is present in [J&K CET 2005]
A)
Protein done
clear
B)
DNA done
clear
C)
RNA done
clear
D)
Both DNA and RNA done
clear
View Solution play_arrow
-
question_answer61)
The enzyme which can cut molecules of DNA into segments is known as [CPMT 1995; MP PMT 1995; BHU 1995; CBSE PMT 2001; Orissa PMT 2002; Kerala CET 2003]
A)
DNA polymerase done
clear
B)
DNA ligase done
clear
C)
Restriction enzyme done
clear
D)
DNA gyrase done
clear
View Solution play_arrow
-
question_answer62)
DNA consists of two complementary nucleotide chains. If the sequence of nucleotide in one of the chains is AGCTTCGA, then the nucleotide sequence in the other chain shall be [BHU 1994; MP PMT 2000; DPMT 2003]
A)
TAGCATAT done
clear
B)
GATCCTAG done
clear
C)
TCGAAGCT done
clear
D)
GCTAAGCT done
clear
View Solution play_arrow
-
question_answer63)
Eukaryotes differ from prokaryotes in the mechanism of DNA replication due to [BHU 1994]
A)
Different enzymes (instead of same enzyme) for synthesis of lagging and leading strands done
clear
B)
Discontinuous rather than semidiscontinuous replication done
clear
C)
Use of DNA primers rather than RNA primers done
clear
D)
Unidirectional rather than bidirectional replication done
clear
View Solution play_arrow
-
question_answer64)
Mode of DNA replication in E. coli is [CPMT 2005]
A)
Conservative and unidirectional done
clear
B)
Semi conservative and unidirectional done
clear
C)
Conservative and bidirectional done
clear
D)
Semi conservative and bidirectional done
clear
View Solution play_arrow
-
question_answer65)
The A/U and G/U ratio in RNA is
A)
\[\ne 0\] done
clear
B)
= T / A Ratio done
clear
C)
= A / T Ratio done
clear
D)
None of these done
clear
View Solution play_arrow
-
question_answer66)
Okazaki segments are formed during [CBSE PMT 1996]
A)
Replication done
clear
B)
Transduction done
clear
C)
Transcription done
clear
D)
Translation done
clear
View Solution play_arrow
-
question_answer67)
Ribosomal RNA is synthesised in [MP PMT 1996]
A)
Nucleolus done
clear
B)
Nucleosome done
clear
C)
Ribosome done
clear
D)
Lysosome done
clear
View Solution play_arrow
-
question_answer68)
DNA is transcribed by some viral RNA using the enzyme [MP PMT 1996]
A)
DNA polymerase done
clear
B)
Reverse transcriptase done
clear
C)
Endonuclease done
clear
D)
Ligase done
clear
View Solution play_arrow
-
question_answer69)
The bacterial genome contains [MP PMT 1996; BHU 2002]
A)
DNA and histone done
clear
B)
DNA or histone done
clear
C)
DNA without histone done
clear
D)
Neither DNA nor histone done
clear
View Solution play_arrow
-
question_answer70)
Transcription of DNA is aided by [MP PMT 1996, 2001, CPMT 2001]
A)
RNA polymerase done
clear
B)
DNA polymerase done
clear
C)
Exonuclease done
clear
D)
Recombinase done
clear
View Solution play_arrow
-
question_answer71)
Which one statement regarding "Okazaki fragment'' is correct
A)
These are double helical fragments of DNA done
clear
B)
These are single stranded fragments of DNA done
clear
C)
These are fragments of mRNA done
clear
D)
These are fragments of tRNA done
clear
View Solution play_arrow
-
question_answer72)
Nobel prize winner E.W. Sutherland demonstrated
A)
Mechanism of action of cAMP done
clear
B)
tRNA done
clear
C)
Operon model done
clear
D)
mRNA done
clear
View Solution play_arrow
-
question_answer73)
Okazaki fragments are synthesised on [CPMT 2005]
A)
Leading strands of DNA only done
clear
B)
Lagging strands of DNA only done
clear
C)
Both leading and lagging strands of DNA done
clear
D)
Complementary DNA done
clear
View Solution play_arrow
-
question_answer74)
mRNA is a polymer of [MP PMT 1997]
A)
Deoxyribonucleosides done
clear
B)
Ribonucleosides done
clear
C)
Deoxyribonucleotides done
clear
D)
Ribonucleotides done
clear
View Solution play_arrow
-
question_answer75)
Non-genetic RNA is of [MP PMT 1999, 2000]
A)
Two types done
clear
B)
Three types done
clear
C)
Only one type done
clear
D)
None of these done
clear
View Solution play_arrow
-
question_answer76)
What is the type of coiling in DNA [MP PMT 1999]
A)
Right-handed done
clear
B)
Left-handed done
clear
C)
Zig-Zag done
clear
D)
Opposite done
clear
View Solution play_arrow
-
question_answer77)
The successive nucleotides of RNA are covalently linked through or antiparallel [CPMT 1999; JIPMER 2001; MP PMT 2001]
A)
Glycosidic bonds done
clear
B)
Phosphodiester bonds done
clear
C)
Hydrogen bonds done
clear
D)
None of these done
clear
View Solution play_arrow
-
question_answer78)
DNA multiplication is called [CPMT 1998, 2003; KCET 1999; MP PMT 2003]
A)
Replication done
clear
B)
Transduction done
clear
C)
Transcription done
clear
D)
Translation done
clear
View Solution play_arrow
-
question_answer79)
Recombinant DNA is achieved by cleaving the pro-DNAs by [CBSE PMT 1998]
A)
Primase done
clear
B)
Exonucleases done
clear
C)
Ligase done
clear
D)
Restriction endonuclease done
clear
View Solution play_arrow
-
question_answer80)
The chemical knives of DNA are [CBSE PMT 1998]
A)
Ligases done
clear
B)
Polymerases done
clear
C)
Endonucleases done
clear
D)
Transcriptases done
clear
View Solution play_arrow
-
question_answer81)
Restriction endonucleases are [CBSE PMT 1998]
A)
Synthesized by bacteria done
clear
B)
Present in mammalian cells for degradation of DNA done
clear
C)
Used in genetic engineering done
clear
D)
Used for in vitro DNA synthesis done
clear
View Solution play_arrow
-
question_answer82)
Which of the following RNAs picks up specific amino acid (from amino acid pool) in the cytoplasm to ribosome during protein synthesis [AIIMS 1998; CBSE PMT 1997]
A)
tRNA done
clear
B)
mRNA done
clear
C)
rRNA done
clear
D)
All of these done
clear
View Solution play_arrow
-
question_answer83)
Which of the following is nongenetic, which is utilised for protein synthesis [AIIMS 1998]
A)
DNA done
clear
B)
zRNA done
clear
C)
mRNA done
clear
D)
None of these done
clear
View Solution play_arrow
-
question_answer84)
The substance that acts as connecting link between two generations is [RPMT 1997]
A)
Ribonucleic acid done
clear
B)
Deoxyribonucleic acid done
clear
C)
Nucleoplasm done
clear
D)
Ribonucleic acid + Deoxyribonucleic acid done
clear
View Solution play_arrow
-
question_answer85)
Which one of the following peak absorption of ultraviolet light by heterocyclic bases (Nitrogen bases) [BHU 2000]
A)
1500 nm done
clear
B)
26 nm done
clear
C)
75 nm done
clear
D)
260 nm done
clear
View Solution play_arrow
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question_answer86)
The enzyme that breaks \[{{H}_{2}}\] bonds in DNA is [Kerala CET 2002]
A)
Helicase done
clear
B)
Topoisomerase done
clear
C)
Ligase done
clear
D)
Polymerase done
clear
View Solution play_arrow
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question_answer87)
Exon part of m-RNAs has code for [CBSE PMT 2002]
A)
Protein done
clear
B)
Lipid done
clear
C)
Phospholipid done
clear
D)
Carbohydrate done
clear
View Solution play_arrow
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question_answer88)
It has not escaped our notice that the specific pairing we have postulated immediately suggests a possible copying mechanism for genetic material. This is written by [Kerala CET 2003]
A)
Meselson and Stahl done
clear
B)
Archibold Garrod done
clear
C)
Severo Ochoa done
clear
D)
Watson and Crick done
clear
View Solution play_arrow
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question_answer89)
Eukaryotic RNA polymerase III catalyse the synthesis of [Kerala CET 2003]
A)
m RNA done
clear
B)
t RNA done
clear
C)
18.5 rRNA done
clear
D)
Introns done
clear
View Solution play_arrow
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question_answer90)
The specific DNA sequence where Eco R1 cuts is [Kerala CET 2003; Orissa JEE 2004]
A)
\[\underset{\text{TAAGCT}}{\mathop{\text{ATTCGA}}}\,\]. done
clear
B)
\[\underset{\text{CTTAAG}}{\mathop{\text{GAATTC}}}\,\] done
clear
C)
\[\begin{align} & GCTTAA \\ & CGAATT \\ \end{align}\] done
clear
D)
\[\begin{align} & GTTCAA \\ & CAAGTT \\ \end{align}\] done
clear
View Solution play_arrow
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question_answer91)
The enzyme DNA polymerase was discovered by [Kerala CET 2003]
A)
Kornberg done
clear
B)
Okazaki done
clear
C)
Waston and Crick done
clear
D)
Jacob and Monod done
clear
View Solution play_arrow
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question_answer92)
What is false about t RNA [AIIMS 2003]
A)
It binds with an amino acid at it 5' end done
clear
B)
It has five double stranded regions done
clear
C)
It has a codon at one end which recognizes the anticodon on messenger RNA done
clear
D)
It looks like clover leaf in the three dimensional structure done
clear
View Solution play_arrow
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question_answer93)
c-DNA can be formed by [DPMT 2003]
A)
Transaminase done
clear
B)
DNA ligase done
clear
C)
RNA dependent DNA polymerase done
clear
D)
DNA dependent DNA polymerase done
clear
View Solution play_arrow
-
question_answer94)
Which of the following is not correct [DPMT 2003; Haryana PMT 2005]
A)
\[\frac{A}{T}=1\] done
clear
B)
\[\text{A}+\text{T}=\text{G}+\text{C}\] done
clear
C)
\[A+G=C+T\] done
clear
D)
None of these done
clear
View Solution play_arrow
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question_answer95)
Which is not correctly matched [BHU 2003]
A)
Lipase - Hydrolysis of fats done
clear
B)
Isomerases - Joining of similar substrate and management of substrate done
clear
C)
Polymerase - Chain elongation done
clear
D)
DNA ligase - Breaks DNA strand into two segments done
clear
View Solution play_arrow
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question_answer96)
In a mutational event, when adenine is replaced by guanine, it is a case of [CBSE PMT 2004]
A)
Transition done
clear
B)
Transversion done
clear
C)
Frameshift mutation done
clear
D)
Transcription done
clear
View Solution play_arrow
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question_answer97)
During transcription, if the nucleotide sequence of the DNA strand that is being coded is ATACG; then the nucleotide sequence in the mRNA would be [CBSE PMT 2004]
A)
UAUGC done
clear
B)
UATGC done
clear
C)
TATGC done
clear
D)
TCTGG done
clear
View Solution play_arrow
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question_answer98)
During replication of a bacterial chromosome DNA synthesis starts from a replication origin site and [CBSE PMT 2004]
A)
Moves in one direction of the site done
clear
B)
Moves in bi-directional way done
clear
C)
RNA primers are involved done
clear
D)
Is facilitated by tolemerase done
clear
View Solution play_arrow
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question_answer99)
Which form of RNA has a structure resembling clover leaf [CBSE PMT 2004]
A)
B)
C)
\[r\]RNA done
clear
D)
\[hn\] RNA done
clear
View Solution play_arrow
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question_answer100)
A given double stranded DNA molecule is 1,00,000 base pairs long. The length of this DNA molecule will be
A)
10,000 nm done
clear
B)
C)
\[{{10}^{4}}nm\] done
clear
D)
2, 00, 000 nm done
clear
View Solution play_arrow
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question_answer101)
DNA repairing is done by [BHU 1985; Kerala CET 2002; AFMC 2004; Orissa JEE 2004]
A)
Ligase done
clear
B)
DNA polymerase III done
clear
C)
DNA polymerase II done
clear
D)
DNA polymerase I done
clear
View Solution play_arrow
-
question_answer102)
Transforming principle in Griffith's experiment was DNA. It was discovered by [MH-CET 2004]
A)
Zinder and Lederberg done
clear
B)
Avery, McLeod and McCarthy done
clear
C)
Lederberg and Tatum done
clear
D)
Zinder and Tatum done
clear
View Solution play_arrow
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question_answer103)
Synthesis of
RNA is [MHCET 2004]
A)
Transcription done
clear
B)
Translation done
clear
C)
Translocation done
clear
D)
Transduction done
clear
View Solution play_arrow
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question_answer104)
The bacterium used in Griffith's experiment was [MHCET 2004]
A)
Bacillus done
clear
B)
Monococcus done
clear
C)
Diplococcus done
clear
D)
Spirillum done
clear
View Solution play_arrow
-
question_answer105)
Which RNA carries information from DNA in protein synthesis [BVP 2000]
A)
s-RNA done
clear
B)
t-RNA done
clear
C)
r-RNA done
clear
D)
m-RNA done
clear
View Solution play_arrow
-
question_answer106)
New strand on a DNA template is initiated by [MHCET 2002]
A)
RNA polymerase done
clear
B)
DNA polymerase done
clear
C)
DNA ligase done
clear
D)
None of the above done
clear
View Solution play_arrow
-
question_answer107)
During DNA replication, the strands separate by [MHCET 2002]
A)
DNA polymerase done
clear
B)
Unwindase done
clear
C)
Gyrase done
clear
D)
Topoisomerase done
clear
View Solution play_arrow
-
question_answer108)
In a given DNA segment the number of nucleotides of guanine is 75 and those of thymine is 75. The total number of nucleotides in the segment will be [MHCET 2002]
A)
75 done
clear
B)
750 done
clear
C)
225 done
clear
D)
300 done
clear
View Solution play_arrow
-
question_answer109)
There are special proteins that help to open up DNA double helix in front of the replication fork. These protein are [MHCET 2003]
A)
DNA ligase done
clear
B)
DNA gyrase done
clear
C)
DNA polymerase I done
clear
D)
None of these done
clear
View Solution play_arrow
-
question_answer110)
In a hair pin model of RNA which nitrogen base is present at the short end [MHCET 2002]
A)
Adenine done
clear
B)
Guanine done
clear
C)
Thymine done
clear
D)
Cytosine done
clear
View Solution play_arrow
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question_answer111)
Which of the following is not found in DNA [CPMT 2005]
A)
Adenine done
clear
B)
Cytosine done
clear
C)
Uracil done
clear
D)
Thymine done
clear
View Solution play_arrow
-
question_answer112)
Choose the correct statement about the direction of DNA strand [MHCET 2004; BVP 2004]
A)
5? ® 3? takes place on template strand done
clear
B)
3? ® 5? takes place on new strand done
clear
C)
5? ® 3? takes place on leading strand done
clear
D)
None of these done
clear
View Solution play_arrow
-
question_answer113)
Which one of the following hydrolyses internal phosphodiester, bonds in a polynucletide chain [CBSE PMT 2005]
A)
Lipase done
clear
B)
Exonuclease done
clear
C)
Endonuclease done
clear
D)
Protease done
clear
View Solution play_arrow
-
question_answer114)
Nucleotides are building blocks of nucleic acids. Each nucleotide is a composite molecule formed by [CPMT 1992; AIIMS 1993; MP PMT 2000; BVP 2001; CBSE PMT 2005]
A)
(Base-sugar-phosphate)n done
clear
B)
Base-sugar-OH done
clear
C)
Base-sugar-phosphate done
clear
D)
Sugar-phosphate done
clear
View Solution play_arrow
-
question_answer115)
Which one of the following makes use of RNA as a template to synthesize DNA [CBSE PMT 2005]
A)
Reverse transcriptase done
clear
B)
DNA dependant RNA polymerase done
clear
C)
DNA polymerase done
clear
D)
RNA polymerase done
clear
View Solution play_arrow
-
question_answer116)
Which is the hereditary material in bacteria [BCECE 2005]
A)
Nucleic acid done
clear
B)
Nucleic acid and cytoplasm done
clear
C)
Nucleic acid and Histone done
clear
D)
None of these done
clear
View Solution play_arrow
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question_answer117)
Unit of nucleic acid is [BCECE 2005]
A)
Nucleotide done
clear
B)
Nucleoside done
clear
C)
Nucleic acid done
clear
D)
All done
clear
View Solution play_arrow
-
question_answer118)
Messenger RNA is produced in [CPMT 2005]
A)
Nucleus done
clear
B)
Golgi apparatus done
clear
C)
Endoplasmic reticulum done
clear
D)
Ribosomes done
clear
View Solution play_arrow
-
question_answer119)
Which is soluble RNA [CPMT 2005]
A)
hnRNA done
clear
B)
rRNA done
clear
C)
mRNA done
clear
D)
tRNA done
clear
View Solution play_arrow
-
question_answer120)
Genetic information transfer nucleus to cytoplasm by [MP PMT 2005]
A)
DNA done
clear
B)
RNA done
clear
C)
Lysosome done
clear
D)
All done
clear
View Solution play_arrow
-
question_answer121)
Supercoiled DNA can be traced in [Wardha 2005]
A)
Prokaryotes and eukaryotes done
clear
B)
Eukaryotes only done
clear
C)
Prokaryotes only done
clear
D)
None of these done
clear
View Solution play_arrow
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question_answer122)
DNA is double helix and [Wardha 2005]
A)
Complementary and parallel done
clear
B)
Complementary and antiparallel done
clear
C)
Without super coils done
clear
D)
Always circular done
clear
View Solution play_arrow
-
question_answer123)
Degeneration of DNA after heating can be studied by comparing [Wardha 2005]
A)
A : T ratio done
clear
B)
G : C ratio done
clear
C)
Sugar : Phosphate done
clear
D)
Number of nucleotides done
clear
View Solution play_arrow
-
question_answer124)
What is Okazaki segment
A)
DNA segment concerning recombination done
clear
B)
Nucleotide chain segment formed during transcription done
clear
C)
Nucleotide chain formed during DNA duplication done
clear
D)
Segment of gene responsible for recombination done
clear
View Solution play_arrow
-
question_answer125)
Complementary DNA (cDNA) is complementary to
A)
mRNA done
clear
B)
tRNA done
clear
C)
rRNA done
clear
D)
None of the above done
clear
View Solution play_arrow
-
question_answer126)
The function of tRNA is [CPMT 1988]
A)
Production of mRNA done
clear
B)
Production of ribosomes done
clear
C)
Production of microsomes done
clear
D)
Selection of amino acids done
clear
View Solution play_arrow
-
question_answer127)
What are informosomes
A)
They are special types of tRNA done
clear
B)
They are more stable forms of eukaryotic mRNA done
clear
C)
They are eukaryotic rRNA done
clear
D)
Both (b) and (c) done
clear
View Solution play_arrow
-
question_answer128)
Heterogenous nuclear RNA
A)
Has lesser number of nucleotides done
clear
B)
Has at least 50 nucleotides done
clear
C)
Has about 100 nucleotides done
clear
D)
Has about 200 or more nucleotides done
clear
View Solution play_arrow
-
question_answer129)
Larger sub-unit of ribosome is composed of how many rRNA molecules
A)
One done
clear
B)
Two done
clear
C)
Three done
clear
D)
Four done
clear
View Solution play_arrow
-
question_answer130)
The contribution of cytoplasmic DNA in cells to total DNA is [DPMT 1986]
A)
1 to 5% done
clear
B)
45 to 50% done
clear
C)
65 to 75% done
clear
D)
95 to 99% done
clear
View Solution play_arrow
-
question_answer131)
The base sequence for a nucleic acid segment is given CAG, AGG, CGA, CCA. From this, it can definitely be concluded that it is a segment of [AIIMS 1983]
A)
DNA strand done
clear
B)
mRNA strand done
clear
C)
tRNA strand done
clear
D)
Data not sufficient done
clear
View Solution play_arrow
-
question_answer132)
The eukaryotic genome differs from the prokaryotic genome because [CBSE PMT 1999]
A)
Repetitive sequences are present in eukaryotes done
clear
B)
Genes in the former case are organized into operons done
clear
C)
The DNA is complexed with histones in prokaryotes done
clear
D)
The DNA is circular and single stranded in prokaryotes done
clear
View Solution play_arrow
-
question_answer133)
The double helix model of Watson and Crick is known as [CPMT 2004]
A)
C-DNA done
clear
B)
B-DNA done
clear
C)
Z-DNA done
clear
D)
D-DNA done
clear
View Solution play_arrow