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
The protein synthesizing machinery of a cell has evolved around:
(1) DNA
(2) RNA
(3) Protein itself
(4) Viroids
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
Which of the following is true for both transcription and DNA replication?
(1) Principle of complementarity governs the processes
(2) Only of the two strands act as template
(3) Only a segment of both strands is involved
(4) Adenine base pairs with thymine
What defines a coding and a template strand in the transcription unit?
(1) Structural gene
(2) Ori
(3) Terminator
(4) Promoter
A segment of DNA coding for a polypeptide is most accurately defined as:
(1) Operon
(2) Gene
(3) Recon
(4) Cistron
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