Which of the following RNA polymerase catalyses the formation of transfer RNA in eukaryotes?

(1) RNA polymerase I                        

(2) RNA polymerase II

(3) RNA polymerase I and II              

(4) RNA polymerase III

Subtopic:  Transcription: IV | Transcription |
 73%
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Out of 64 codons how many of them code for amino acids?

(1) 64                            

(2) 20                            

(3) 61                            

(4) 32

Subtopic:  Genetic Code: II | Genetic Code |
 82%
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Circular DNA is found in:
(1) Viruses

(2) Bacteria, chloroplast and mitochondria

(3) Chloroplast and mitochondria alone

(4) All of these

Subtopic:  DNA Replication: II | DNA Replication |
 55%
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If in a DNA molecule cytosine is 18%, the percentage of adenine would be:

(a) 18%                (b) 32%                (c) 36%                (d) 64%

Subtopic:  The DNA |
 89%
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Isotopes used in proving semiconservative replication of DNA were:

(1) 14N 14C            

(2) 14N 15N            

(3) 14N 31P             

(4) 14C 31P

Subtopic:  DNA Replication: I | DNA Replication |
 94%
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Bacterial nucleoid has:

(1) One single-stranded DNA            

(2) One double-stranded DNA

(3) Two single-stranded DNA             

(4) Many double-stranded DNAs

Subtopic:  DNA Replication: II | DNA Replication |
 62%
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Imagine an error occurring during DNA replication in a cell, so that where there is supposed to be a T in one of the genes there is instead a G. What effect will this probably have on the cell?
(1) The amino acid sequence of one of its kinds of proteins will be completely changed

(2) An amino acid will be missing from each of its kinds of proteins

(3) One of its kinds of proteins might contain an incorrect amino acid

(4) An amino acid will be missing from one of its kinds of proteins.

Subtopic:  Genetic Code: II | Genetic Code |
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A sequence of pictures of polypeptide synthesis shows a ribosome holding two transfer RNAs. One tRNA has a polypeptide chain attached to it; the other tRNA has a single amino acid attached to it. What does the next picture show?
(1) The polypeptide chain moves over and bonds to the single amino acid

(2) The tRNA with the amino acid leaves the ribosome

(3) The amino acid moves over and bonds to the polypeptide chain

(4) The tRNA with the polypeptide chain leaves the ribosome

Subtopic:  Translation Mechanism |
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Column-I                                               Column-II
I. Genome of ϕ 174 bacteriophage           A. Ribozyme, RNAase
II. Purine                                               B. 5386 Nucleotides
III. Catalytic RNA                                   C. Adenine and Guanine
IV. Any chemical change in DNA              D. Mutation
The correct match is:
(1) I - D, II - B, III - A, IV - C                 

(2) I - B, II - A, III - D, IV - C

(3) I - D, II - C, III - A, IV - B                 

(4) I - B, II - C, III - A, IV - D

Subtopic:  The DNA | DNA Double Helix |
 89%
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Column-I                                        Column-II
I. Operator site                               A. Binding site for RNA polymerase
II. Promoter site                              B. Binding site for repressor molecule
III. Structural gene                          C. Codes for enzyme protein
IV. Regulator gene                          D. Code for repressor molecules
The correct match is:
(1) I - B, II - A, III - C, IV - D         

(2) I - B, II - A, III - D, IV - C

(3) I - D, II - C, III - A, IV - B         

(4) I - B, II - C, III - A, IV - D

Subtopic:  Gene Regulation: Lac Operon |
 74%
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