Q. No.Viruses grown on radioactive sulfur contain:
(1) Radioactive proteins but not DNA
(2) Radioactive DNA but not proteins
(3) Radioactive proteins and DNA
(4) Nonradioactive DNA and protein
(1) Radioactive proteins but not DNA
(2) Radioactive DNA but not proteins
(3) Radioactive proteins and DNA
(4) Nonradioactive DNA and protein
Hershey and Chase proved DNA as the genetic material as in their experiment:
(1) Bacteria that were infected with viruses that had radioactive proteins were not radioactive
(2) Bacteria that were infected with viruses that had radioactive DNA were radioactive
(3) Both 1 and 2 are correct
(4) Both 1 and 2 are incorrect
RNA is not the genetic material in:
1. Tobacco mosaic virus
2. QB bacteriophage
3. HIV
4. Archaebacteria
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
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
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