-
question_answer1)
The process by which DNA of nucleus passes genetic information to mRNA [AIIMS 1980, 81; DPMT 1986; MP PMT 1984]
A)
Translocation done
clear
B)
Transcription done
clear
C)
Translation done
clear
D)
Transportation done
clear
View Solution play_arrow
-
question_answer2)
Translation is called [BHU 1987; CPMT 1996; MP PMT 2001]
A)
Formation of RNA from DNA done
clear
B)
Formation of DNA from DNA done
clear
C)
Formation of DNA from RNA done
clear
D)
Protein formation done
clear
View Solution play_arrow
-
question_answer3)
Who discovered "Reverse transcription?? [MP PMT 1999; Pb. PMT 1999, 2000]
A)
Watson and Crick done
clear
B)
Beadle and tatum done
clear
C)
Temin and Baltimore done
clear
D)
Khorana done
clear
View Solution play_arrow
-
question_answer4)
Repressor protein is formed from [MP PMT 1996]
A)
Repressor gene done
clear
B)
Structural gene done
clear
C)
Operator gene done
clear
D)
Regulatory gene done
clear
View Solution play_arrow
-
question_answer5)
Which one process is only concerned with the transcription
A)
Template binding done
clear
B)
Chain initiation done
clear
C)
Chain elongation done
clear
D)
Chain termination done
clear
View Solution play_arrow
-
question_answer6)
What is meant by sense strand
A)
The strand of mRNA involved in protein synthesis done
clear
B)
The strand of tRNA which starts protein synthesis done
clear
C)
The DNA strand which acts as a template for mRNA transcription done
clear
D)
Gradually growing molecule of protein done
clear
View Solution play_arrow
-
question_answer7)
Who first suggested the idea of circular flow of genetic information
A)
Barry Commoner done
clear
B)
Nirenberg done
clear
C)
Matthaei done
clear
D)
Phil Lader done
clear
View Solution play_arrow
-
question_answer8)
Process of reverse transcription was discovered by Temin in
A)
MS-2 bacteriophage done
clear
B)
Rous sarcoma virus done
clear
C)
E. coli done
clear
D)
Neurospora done
clear
View Solution play_arrow
-
question_answer9)
DNA strand is directly involved in the synthesis of all the following except [AIIMS 1981]
A)
tRNA molecule done
clear
B)
mRNA molecule done
clear
C)
Another DNA strand done
clear
D)
Protein synthesis done
clear
View Solution play_arrow
-
question_answer10)
Synthesis of any protein in a cell determines [CPMT 1988]
A)
Types of ribosomes done
clear
B)
Mitochondria done
clear
C)
Sequence of nucleotides in DNA done
clear
D)
Suger and phosphate of DNA done
clear
View Solution play_arrow
-
question_answer11)
The genes are responsible for growth and differentiation in an organism through regulation of [MP PMT 1994]
A)
Translocation done
clear
B)
Transformation done
clear
C)
Transduction and translation done
clear
D)
Translation and transcription done
clear
View Solution play_arrow
-
question_answer12)
If in a test tube, mRNA of E. coli cells and tRNAs from the body of rats are taken and sufficient number of amino acids are put, then the polypeptide synthesized will be of the nature of
A)
Rat body cells done
clear
B)
E. coli cells done
clear
C)
Both E. coli and rat body cells done
clear
D)
Polypeptide synthesis will not occur done
clear
View Solution play_arrow
-
question_answer13)
In a cell, protein synthesis occurs by the linking together of amino acids. The base sequence of mRNA defines the primary structure of proteins because
A)
Amino acid molecules align directly on the polynucleotide of mRNA done
clear
B)
It determines the order of alignment of amino acid charged tRNA molecule done
clear
C)
There is one to one coding relationship between each base on the mRNA and each amino acid done
clear
D)
Each amino acid is defined by a pair of bases on the mRNA done
clear
View Solution play_arrow
-
question_answer14)
A polypeptide of five amino acids is synthesized during protein synthesis in eukaryotic cells. Which one of the following can be the correct polypeptide
A)
Glycine - valine - methionine - histidine - lysine done
clear
B)
Methionine - glycine - histidine - lysine - valine done
clear
C)
Valine - methionine - glycine - histidine - lysine done
clear
D)
Histidine - lysine - methionine - valine - glycine done
clear
View Solution play_arrow
-
question_answer15)
One strand of the given segment of DNA codes for mRNA having the sequence AUC, GCG, UCA needed for synthesis of proteins. The strand by which DNA molecule will be responsible for the above mRNA sequence is
A)
\[\underset{TAG}{\mathop{\underset{|}{\mathop{ATC}}\,}}\,\,\,\,\,\underset{CGG}{\mathop{\underset{|}{\mathop{GCC}}\,}}\,\,\,\,\,\underset{TAG}{\mathop{\underset{|}{\mathop{ATU}}\,}}\,\] done
clear
B)
\[\underset{TCT}{\mathop{\underset{|}{\mathop{AGA}}\,}}\,\,\,\,\underset{CGC}{\mathop{\underset{|}{\mathop{GCG}}\,}}\,\,\,\,\underset{CTA}{\mathop{\underset{|}{\mathop{GAT}}\,}}\,\] done
clear
C)
\[\underset{ACT}{\mathop{\underset{|}{\mathop{TGA}}\,}}\,\,\,\,\underset{GCG}{\mathop{\underset{|}{\mathop{CGC}}\,}}\,\,\,\,\underset{ATC}{\mathop{\underset{|}{\mathop{TAG}}\,}}\,\] done
clear
D)
\[\underset{ATC}{\mathop{\underset{|}{\mathop{TAG}}\,}}\,\,\,\,\underset{GCG}{\mathop{\underset{|}{\mathop{CGC}}\,}}\,\,\,\,\underset{TCA}{\mathop{\underset{|}{\mathop{AGT}}\,}}\,\] done
clear
View Solution play_arrow
-
question_answer16)
If a certain group of cells utilise the amino acid glycine exclusively for protein synthesis, and if a growing culture of these cells is fed radioactive glycine, radioactivity will be found first in the
A)
Ribosomes done
clear
B)
tRNA done
clear
C)
mRNA done
clear
D)
Mitochondria done
clear
View Solution play_arrow
-
question_answer17)
It has been found in many cells that ribosomes occur in chains along mRNA molecules. What is the advantage of this arrangement as compared to a situation in which ribosomes occur singly
A)
Fewer tRNA molecules are used in protein synthesis done
clear
B)
Polypeptides can be produced more easily done
clear
C)
A greater variety of polypeptides can be produced done
clear
D)
Probability of gene mutation occurring is less done
clear
View Solution play_arrow
-
question_answer18)
Streptomycin and related antibiotics bind to small sub-units of ribosomes in prokaryotes and they
A)
Inhibit protein synthesis done
clear
B)
Block the action of peptidyl transferase done
clear
C)
Cause misreading of the genetic codes done
clear
D)
Cause point mutation done
clear
View Solution play_arrow
-
question_answer19)
A polypeptide is produced as dictated by mRNA, the number of bases on the mRNA that code for the polypeptide portion containing N-terminal amino acid and next 13 amino acid is
A)
26 done
clear
B)
36 done
clear
C)
42 done
clear
D)
39 done
clear
View Solution play_arrow
-
question_answer20)
Which of the following is genetically inert and does not transcribe messenger RNA for protein synthesis
A)
DNA of euchromatin done
clear
B)
DNA of heterochromatin done
clear
C)
DNA of euchromatin and heterochromatin done
clear
D)
None of the above done
clear
View Solution play_arrow
-
question_answer21)
'Central Dogma' was proposed by [RPMT 1995]
A)
Crick done
clear
B)
Beadle and Tatum done
clear
C)
Temin and Baltimore done
clear
D)
Klug done
clear
View Solution play_arrow
-
question_answer22)
Transcription is a process by which [MP PMT 1994, 2002; Manipal 1995]
A)
Amino acids are joined to form polypeptides done
clear
B)
An RNA molecule is synthesized on a DNA template done
clear
C)
An RNA molecule is synthesized within a ribosome done
clear
D)
Two daughter strands of DNA are synthesized done
clear
View Solution play_arrow
-
question_answer23)
RNA which carry amino acid from the cytoplasm to the ribosome is
A)
m-RNA done
clear
B)
t-RNA done
clear
C)
r-RNA done
clear
D)
c-RNA done
clear
View Solution play_arrow
-
question_answer24)
In lac operon system lac gene - I codes for [BHU 2005]
A)
Inducer done
clear
B)
Repressor done
clear
C)
Promoter done
clear
D)
\[\beta -\]galactosidase done
clear
View Solution play_arrow
-
question_answer25)
Which of the following step of translation does not consume a high energy phosphate bond [CBSE PMT 1997]
A)
Translocation done
clear
B)
Amino acid activation done
clear
C)
Peptidyl transferase reaction done
clear
D)
Aminoacyl tRNA binding to A-site done
clear
View Solution play_arrow
-
question_answer26)
Transcription means synthesis of [MP PMT 1997, 98]
A)
DNA done
clear
B)
RNA done
clear
C)
m-RNA done
clear
D)
t-RNA done
clear
View Solution play_arrow
-
question_answer27)
The processes by which mRNA is made by DNA and protein by mRNA are respectively called as [MP PMT 1998]
A)
Transcription and translation done
clear
B)
Translation and transcription done
clear
C)
Synthesis of mRNA and protein done
clear
D)
Replication of mRNA and protein done
clear
View Solution play_arrow
-
question_answer28)
In protein synthesis, the polymerization of amino acids involves three steps. Which of the following is not involved in protein synthesis [BHU 2000]
A)
Elongation done
clear
B)
Transcription done
clear
C)
Termination done
clear
D)
Initiation done
clear
View Solution play_arrow
-
question_answer29)
Who proposed the 'Signal hypothesis' meant for the biosynthesis of secretory type of proteins [AFMC 2000]
A)
Baltimore done
clear
B)
Camillio Golgi done
clear
C)
Blobel and Sabatini done
clear
D)
Sheeler and Bianchi done
clear
View Solution play_arrow
-
question_answer30)
Which amino acids are present in histones [Orissa JEE 2004]
A)
Lysine and histidine done
clear
B)
Valine and Histidine done
clear
C)
Arginine and lysine done
clear
D)
Arginine and histidine done
clear
View Solution play_arrow
-
question_answer31)
After a mutation at a genetic locus the character of an organism changes due to the change in [CBSE PMT 2004]
A)
Protein synthesis pattern done
clear
B)
RNA transcription pattern done
clear
C)
Protein structure done
clear
D)
DNA replication done
clear
View Solution play_arrow
-
question_answer32)
DNA is not directly involved with the synthesis of the following [MHCET 2002]
A)
m-RNA done
clear
B)
r-RNA done
clear
C)
t-RNA done
clear
D)
Protein done
clear
View Solution play_arrow
-
question_answer33)
The central dogma of protein synthesis is [MHCET 2002]
A)
DNA \[\xrightarrow{\text{Translation}}m-\]RNA\[\xrightarrow{\text{Transcription}}\] protein done
clear
B)
C)
RNA \[\xrightarrow{\text{Replication}}\]DNA \[\xrightarrow{\text{Transcription}}\]protein done
clear
D)
View Solution play_arrow
-
question_answer34)
During protein denaturation which of the following is disrupted [BVP 2004]
A)
2D structure done
clear
B)
3D structure done
clear
C)
Peptide bond done
clear
D)
AA sequence done
clear
View Solution play_arrow
-
question_answer35)
Protein synthesis in an animal cell occurs [CBSE PMT 2005]
A)
Only on the ribosomes present in cytosol done
clear
B)
On ribosomes present in cytoplasm as well as in mitochondria done
clear
C)
Only on ribosomes attached to the nuclear envelope and endoplasmic reticulum done
clear
D)
On ribosomes present in the nucleolus as well as in cytoplasm done
clear
View Solution play_arrow
-
question_answer36)
Which of the following is the simplest amino acid [CBSE PMT 2005]
A)
Tyrosine done
clear
B)
Asparagine done
clear
C)
Glycine done
clear
D)
Alanine done
clear
View Solution play_arrow
-
question_answer37)
Which of the following is not correct about translation [BCECE 2005]
A)
It starts with AUG done
clear
B)
Stopped at termination codon done
clear
C)
Based on operon model done
clear
D)
Occurs in nucleus done
clear
View Solution play_arrow
-
question_answer38)
Method by which information from DNA to RNA reach [BCECE 2005]
A)
Transcription done
clear
B)
Translation done
clear
C)
Transformation done
clear
D)
Transduction done
clear
View Solution play_arrow
-
question_answer39)
Which of the following inhibits protein synthesis by binding to 50 S ribosome [Orissa JEE 2005]
A)
Tetracycline done
clear
B)
Streptomycin done
clear
C)
Erythromycin done
clear
D)
Penicillin done
clear
View Solution play_arrow
-
question_answer40)
Portion of gene which is transcribed but not translated is [CPMT 2005]
A)
Exon done
clear
B)
Intron done
clear
C)
Cistron done
clear
D)
Codon done
clear
View Solution play_arrow
-
question_answer41)
Transcription is [Haryana PMT 2005]
A)
Formation of RNA from DNA done
clear
B)
Formation of DNA from RNA done
clear
C)
Formation of protein done
clear
D)
Transfer or RNA done
clear
View Solution play_arrow
-
question_answer42)
Where Anticodon occurs in transcription [AMU 2005]
A)
m-RNA done
clear
B)
t-RNA done
clear
C)
µ-RNA done
clear
D)
DNA done
clear
View Solution play_arrow
-
question_answer43)
Which enzyme plays important role in transcription [AMU 2005]
A)
DNA dependent RNA polymerase done
clear
B)
DNA dependent DNA polymerase done
clear
C)
RNA dependent DNA polymerase done
clear
D)
RNA dependent RNA polymerase done
clear
View Solution play_arrow
-
question_answer44)
What is transfer of DNA ® RNA called [MP PMT 2005]
A)
Transcription done
clear
B)
Translation done
clear
C)
Protein synthesis done
clear
D)
Central dogma done
clear
View Solution play_arrow
-
question_answer45)
Initiation of polypeptide chain in eukaryotic protein synthesis is induced by [AIIMS 1985]
A)
Methionine done
clear
B)
Leucine done
clear
C)
Lysine done
clear
D)
Glycine done
clear
View Solution play_arrow
-
question_answer46)
If in a plant cells the ribosomes are destroyed, which of the following process will not take place
A)
Respiration done
clear
B)
Photosynthesis done
clear
C)
Fat synthesis done
clear
D)
Protein synthesis done
clear
View Solution play_arrow
-
question_answer47)
What is meant by monocistronic mRNA
A)
Which has codons for synthesizing only one protein molecule done
clear
B)
Which has only one codon done
clear
C)
Which can combine with only one type of tRNA done
clear
D)
Both (a) and (c) done
clear
View Solution play_arrow
-
question_answer48)
The most commonly used enzyme for polymerase chain reaction is [MP PMT 2001]
A)
D.N.A. polymerase-II done
clear
B)
Reverse transcriptase done
clear
C)
Klenow fragment done
clear
D)
Taq polymerase done
clear
View Solution play_arrow