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question_answer1)
There are 64 types of codons in genetic code dictionary because [CBSE PMT 1990]
A)
There are 64 types of tRNA's found in cell done
clear
B)
There are 44 meaningless and 20 codons for amino acids done
clear
C)
There are 64 amino acids for coding done
clear
D)
Genetic code is triplet done
clear
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question_answer2)
Barbara McClintock is famous for her work on [BHU 1984; AIIMS 1984]
A)
Wheat done
clear
B)
Rice done
clear
C)
Maize done
clear
D)
Pisum done
clear
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question_answer3)
Genes express their character by forming
A)
Enzymes done
clear
B)
Carbohydrates done
clear
C)
Fats done
clear
D)
Vitamins done
clear
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question_answer4)
The codons causing chain termination are [CBSE PMT 1997; BVP 2001, 02; Kerala CET 2003; MHCET 2003; Pb. PMT 2004]
A)
TAG, TAA, TGA done
clear
B)
GAT, AAT, AGT done
clear
C)
AGT, TAG, UGA done
clear
D)
UAG, UGA, UAA done
clear
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question_answer5)
In mRNA, AUG is the initiation codon and UAA, UAG and UGA are termination codons, therefore polypeptide cannot be synthesized beyond any of these triplets to the end of mRNA. Then which one of the following mRNA can be translated completely [AFMC 1993]
A)
AUG UUC UCC UGG UAA UAU done
clear
B)
AUG UUC UCC UGA UGG UAU done
clear
C)
AUC ACG UAU UUC UGA CUC done
clear
D)
AUG UAU UUC UGC CUC UAG done
clear
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question_answer6)
Genetic code consists of [AFMC 1993; CBSE PMT 1988]
A)
4 codons, each with two nucleotides done
clear
B)
16 codons, each with four nucleotides done
clear
C)
64 codons, each with two nucleotides done
clear
D)
64 codons, each with three nucleotides done
clear
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question_answer7)
Diamond code proposal was made by
A)
Watson done
clear
B)
Nirenberg done
clear
C)
Gamow done
clear
D)
Stahl done
clear
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question_answer8)
Assumption that genetic code is a triplet was suggested by [BHU 1984, 87]
A)
Gamow done
clear
B)
Beadle and Tatum done
clear
C)
S. Brenner done
clear
D)
Nirenberg and Matthaei done
clear
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question_answer9)
Property of a codon for always coding a specific amino acid is called
A)
Degenerate done
clear
B)
Non-ambiguous done
clear
C)
Non-overlapping done
clear
D)
None of the above done
clear
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question_answer10)
Who first discovered genetic code [MP PMT 1996]
A)
Khorana done
clear
B)
Nirenberg and Mathaei done
clear
C)
Kornberg done
clear
D)
Phil Lader and Barnett done
clear
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question_answer11)
What is meant by degenerate code
A)
One amino acid is coded by one code done
clear
B)
One amino acid can be coded by more than one code done
clear
C)
One code controls one code done
clear
D)
One code can control more than one amino acid done
clear
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question_answer12)
Genetic codes are
A)
Similar in mtDNA, virusus, bacteria and eukaryotes done
clear
B)
Different in viruses and bacteria done
clear
C)
Different in mtDNA done
clear
D)
Different in mtDNA and bacteria done
clear
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question_answer13)
In Operon concept, the regulator gene regulates chemical reactions in the cell by [AIIMS 1985]
A)
Inactivating enzymes in the reaction done
clear
B)
Inhibiting transcription of mRNA done
clear
C)
Inhibiting migration of mRNA into cytoplasm done
clear
D)
Inhibiting the substrate in the reaction done
clear
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question_answer14)
The genetic code is called a degenerate code because [JIPMER 1994]
A)
More than one codon has the same meaning done
clear
B)
1 codon has many meaning done
clear
C)
1 codon has one meaning done
clear
D)
There are 64 codons done
clear
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question_answer15)
The arrangement of three bases in the genetic code signifies a specific [MP PMT 1994]
A)
Protein done
clear
B)
Amino acid done
clear
C)
Plasmid done
clear
D)
Nucleic acid done
clear
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question_answer16)
The genetic code necessary for building up its own amino acids during the multiplication of virus, is carried by
A)
The virus nucleic acid done
clear
B)
The virus protein done
clear
C)
The host protein done
clear
D)
The host nucleic acid done
clear
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question_answer17)
An inactive repressor produced by regulator gene that does not block the operator site in the tryptophan Operon is called
A)
Aporepressor done
clear
B)
Intron done
clear
C)
Exon done
clear
D)
Clone done
clear
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question_answer18)
Wild type E.coli cells are growing in normal medium with glucose. They are transferred to a medium containing only lactose as the sugar. Which one of the following changes take place [CBSE PMT 1995]
A)
The lac-Operon is repressed done
clear
B)
All Operons are induced done
clear
C)
E. coli cells stop dividing done
clear
D)
The lac-Operon is induced done
clear
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question_answer19)
Khorana got the Nobel Prize on [CPMT 1995; Pb. PMT 1999]
A)
DNA synthesis done
clear
B)
Genetic code done
clear
C)
Protein synthesis done
clear
D)
Enzyme synthesis done
clear
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question_answer20)
The possibility of three letter genetic code was pointed out by
A)
Khorana done
clear
B)
Gamow done
clear
C)
Holley done
clear
D)
Nirenberg done
clear
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question_answer21)
Which is not true for Operon model
A)
Regulator gene done
clear
B)
Promotor gene done
clear
C)
Repressor gene done
clear
D)
Operator gene done
clear
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question_answer22)
Who was awarded Nobel prize for the synthesis of an artificial gene [Kerala PMT 2004]
A)
Hargovind Khorana done
clear
B)
M.S. Swaminathan done
clear
C)
B.P. Pal done
clear
D)
P. Maheshwari done
clear
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question_answer23)
'Operon model' for gene regulation in bacteria was proposed by
A)
Jacob and Monad done
clear
B)
Barry Commoner done
clear
C)
Crick done
clear
D)
Watson and Crick done
clear
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question_answer24)
Which of the following bases is absent in the coding dictionary
A)
Uracil done
clear
B)
Thymine done
clear
C)
Cytosine done
clear
D)
Adenine done
clear
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question_answer25)
Pleitrophy is a condition in which a single gene [AMU 2005]
A)
Controls only one phenotype done
clear
B)
Controls more than one phenotype done
clear
C)
Does not control any phenotype done
clear
D)
None of these done
clear
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question_answer26)
When more than one codon code for the same amino acid, this is called as [MP PMT 1998]
A)
Universal nature of genetic code done
clear
B)
Redundancy of genetic code done
clear
C)
Punctuation in genetic code done
clear
D)
Continuous nature of genetic code done
clear
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question_answer27)
In Operon concept, regulator gene functions as [CBSE PMT 1999; KCET 2004]
A)
Repressor done
clear
B)
Regulator done
clear
C)
Inhibitor done
clear
D)
All of these done
clear
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question_answer28)
Genes that are involved in turning on or off the transcription of a set of structural genes are called [CBSE PMT 1998]
A)
Polymorphic genes done
clear
B)
Operator genes done
clear
C)
Redundant genes done
clear
D)
Regulatory genes done
clear
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question_answer29)
Functioning of structural genes is controlled by [MP PMT 2001]
A)
Operator done
clear
B)
Promoter done
clear
C)
Ligase done
clear
D)
Regulatory gene done
clear
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question_answer30)
Wobble hypothesis was given by [AIIMS 2002]
A)
R. W. Holley done
clear
B)
H. G. Khorana done
clear
C)
M. Nirenberg done
clear
D)
F. H. C. Crick done
clear
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question_answer31)
Out of 64 codons, 61 codons code for 20 types of amino acid. It is called [CBSE PMT 2002]
A)
Wobbling of codon done
clear
B)
Overlapping of gene done
clear
C)
Universility of codons done
clear
D)
Degeneracy of genetic code done
clear
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question_answer32)
The regulatory genes are located [Kerala CET 2003]
A)
Along with the structural genes done
clear
B)
In between operator and the structural genes done
clear
C)
In the middle of structural genes done
clear
D)
At the end of structural genes done
clear
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question_answer33)
Which one of the following codons codes for the same information as UGC [AIIMS 2003]
A)
UGU done
clear
B)
UGA done
clear
C)
UAG done
clear
D)
UGG done
clear
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question_answer34)
Identify the correct match between the codons and coding functions. [Kerala PMT 2004]
|
Column I |
Column II |
A. |
AUG |
1. Phenylalanine |
B. |
UAA |
2. Methionine |
C. |
UUU |
3. Tryptophan |
D. |
UGG |
4. Termination |
A)
A-1, B-4, C-2, D-3 done
clear
B)
A-2, B-4, C-1, D-3 done
clear
C)
A-4, B-3, C-2, D-1 done
clear
D)
A-4, B-1, C-3, D-2 done
clear
E)
A-2, B-3, C-4, D-1 done
clear
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question_answer35)
Which one of the following pairs is correctly matched [Kerala PMT 2004]
A)
Ribosomal RNA-carries aminoacids to the site of protein synthesis done
clear
B)
Transcription-process by which protein is synthesized done
clear
C)
Translation-process by which \[mRNA\] carries the information from nucleus to the ribosome done
clear
D)
E)
Cistron-is a unit of mutation done
clear
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question_answer36)
A naturally occurring coding strand composed of alternating C and U residues would result in the formation of [Kerala PMT 2004]
A)
A polypeptide containing alternating leu and ser residues done
clear
B)
A polypeptide containing either leu or ser residues done
clear
C)
A polypeptide containing only leu residues done
clear
D)
A polypeptide containing only ser residues done
clear
E)
A polypeptide containing only phe residues done
clear
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question_answer37)
Which one of the following pairs is correctly matched with regard to the codon and the amino acid coded by it [AIIMS 2004]
A)
UUA-Valine done
clear
B)
AAA-Lysine done
clear
C)
AUG-Cysteine done
clear
D)
CCC-Alanine done
clear
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question_answer38)
A sequence of how many nucleotides in messenger RNA makes a codon for an amino acid [CBSE PMT 2004]
A)
One done
clear
B)
Two done
clear
C)
Three done
clear
D)
Four done
clear
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question_answer39)
In the lactose operon of Escherichia coli, what is the function of promoter
A)
Binding of Gyrase enzyme done
clear
B)
Binding of RNA polymerase done
clear
C)
Codes for RNA polymerase done
clear
D)
Processing of messenger RNA done
clear
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question_answer40)
Operon is [Kerala PMT 2004]
A)
A set of closely linked genes regulating a metabolic pathways in prokaryotes done
clear
B)
The sequence of three nitrogen bases determining a single amino acid done
clear
C)
The sequence of nitrogen bases in mRNA which codes for a single amino acid done
clear
D)
A gene responsible for switching on or off other genes done
clear
E)
A segment of DNA specifying one polypeptide chain in protein synthesis done
clear
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question_answer41)
Code of m-RNA and proteins are [DPMT 2004]
A)
Coplanar done
clear
B)
Colinear done
clear
C)
Nonlinear done
clear
D)
Irregular done
clear
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question_answer42)
In a double stranded DNA, the sequences of base pairs in one strand are AGCTAAGCC. What?s the complementary sequence on the other strand [BVP 2004]
A)
TCGATTCGG done
clear
B)
CGUAUUCG done
clear
C)
AGCTAAGC done
clear
D)
CAUTAUCG done
clear
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question_answer43)
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
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question_answer44)
In lac operon model; repressor protein binds to which site [Manipal 2005]
A)
Regular done
clear
B)
Promotor done
clear
C)
Operator done
clear
D)
Structural genes done
clear
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question_answer45)
Terminator gene [BHU 2005]
A)
Help in terminating flowering done
clear
B)
Help in terminating seed germination done
clear
C)
Used in hybridisation done
clear
D)
None of these done
clear
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question_answer46)
In the lac operon, the structural genes are switched off when [Kerala CET 2005]
A)
Repressor binds to operator done
clear
B)
Repressor binds to promotor done
clear
C)
Repressor binds to regular done
clear
D)
Repressor binds to inducer done
clear
E)
Repressor binds to allolactose done
clear
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question_answer47)
In a given DNA segment ATGACC AGG ACC CCA ACA, the first base gets mutated. The effect of this on coding by this DNA segment will result in [Kerala CET 2005]
A)
Complete change in the type as well as sequence of amino acids done
clear
B)
Change in the first amino acid only done
clear
C)
No change in the squence done
clear
D)
One amino acid less in the protein done
clear
E)
No coding done
clear
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question_answer48)
Which one of the following is common to both prokaryotes and eucaryotes [Kerala CET 2005]
A)
Mitotic apparatus done
clear
B)
Histones done
clear
C)
Mitochondira done
clear
D)
Genetic code done
clear
E)
Endoplasmic reticulum done
clear
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question_answer49)
Triplet codon in genetics is [Wardha 2005]
A)
Fixed done
clear
B)
Degenerate done
clear
C)
Ambiguous done
clear
D)
Non-wobbly done
clear
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question_answer50)
Genetic code translates the language of [AMU 1989]
A)
RNA into that of proteins done
clear
B)
Proteins into that of RNA done
clear
C)
Amino acids into that of RNA done
clear
D)
RNA into that of DNA done
clear
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question_answer51)
Jacob and Monad studied lactose metabolism in E. coli and proposed operon concept, which is applicable for [CBSE PMT 2002]
A)
Prokaryotes done
clear
B)
Eukaryotes done
clear
C)
Protozoanes done
clear
D)
All of these done
clear
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question_answer52)
Anticodon is [CBSE PMT 1995]
A)
Paired triplet of bases on messenger RNA done
clear
B)
Unpaired triplet of bases on rRNA done
clear
C)
Paired triplet of bases on rRNA done
clear
D)
An unpaired triplet of bases in an exposed position of tRNA done
clear
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question_answer53)
A triplet codon means [KCET 1994; J&K CET 2002]
A)
A sequence of three nitrogen bases on mRNA done
clear
B)
A sequence of three nitrogen bases in tRNA done
clear
C)
A sequence of three bases in rRNA done
clear
D)
The presence of only three bases in mRNA done
clear
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