Q. No.DNA is structurally and chemically more stable than RNA because of all the following except:
(1) It has thymine instead of uracil
(2) 2’ –OH is absent in DNA
(3) It replicates itself based on complementary base pairing
(4) It does not have any catalytic role
(1) It has thymine instead of uracil
(2) 2’ –OH is absent in DNA
(3) It replicates itself based on complementary base pairing
(4) It does not have any catalytic role
Who proposed semi-conservative mode of replication for DNA?
(1) Watson and Crick
(2) Meselson and Stahl
(3) Hershey and Chase
(4) Beadle and Tatum
What radioactive isotope was use by Meselson and Stahl to label DNA in their experiment?
1. 35 S
2. 15 N
3. 32 P
4. None
Any mistakes during DNA replication by the enzyme would result into:
(1) Cancer
(2) Apoptosis
(3) Cell fragmentation
(4) Mutation
Which of the following acts as the substrate and provide energy for DNA replication?
(1) Dideoxyribonucleoside triphosphates
(2) Ribonucleoside triphosphates
(3) Deoxyribonucleoside triphosphates
(4) Deoxyribonucleotide triphosphates
The discontinuously synthesized DNA fragments are later joined by:
(1) DNA helicase
(2) Topoisomerase
(3) DNA ligase
(4) DNA polymerase
In actual structure, tRNA is a compact molecule which looks like a/an:
(1) Clover leaf
(2) Rail road
(3) Inverted L
(4) Alpha helix
Which of the following anticodons will hybridize with the mRNA codon 5’ – AUG – 3’?
1. 5’ – UAC – 3’
2. 5’ – TAC – 3’
3. 3’ – UAC – 5’
4. 3’ – TAC – 5’
Which of the following acts as a ribozyme for peptide bond formation in bacteria?
(1) 5s rRNA
(2) 23s rRNA
(3) 16s rRNA
(4) 5.1s rRNA
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