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

Subtopic:  Search for Genetic Material: II | Search for Genetic Material |
 71%
From NCERT
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RNA is not the genetic material in:

1. Tobacco mosaic virus

2. QB bacteriophage

3. HIV

4. Archaebacteria

Subtopic:  DNA vs RNA as Genetic Material |
 75%
From NCERT
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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

Subtopic:  DNA vs RNA as Genetic Material |
From NCERT
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The protein synthesizing machinery of a cell has evolved around:

(1) DNA

(2) RNA

(3) Protein itself

(4) Viroids

Subtopic:  The DNA | DNA vs RNA as Genetic Material |
 80%
From NCERT
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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

Subtopic:  DNA Replication: I | DNA Replication |
 56%
From NCERT
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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

Subtopic:  Search for Genetic Material: II | Search for Genetic Material |
From NCERT
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Any mistakes during DNA replication by the enzyme would result into:

(1) Cancer

(2) Apoptosis

(3) Cell fragmentation

(4) Mutation

Subtopic:  DNA Replication:III | DNA Replication |
 92%
From NCERT
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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

Subtopic:  DNA Replication: II | DNA Replication |
 66%
From NCERT
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The discontinuously synthesized DNA fragments are later joined by:

(1) DNA helicase

(2) Topoisomerase

(3) DNA ligase

(4) DNA polymerase

Subtopic:  DNA Replication:III | DNA Replication |
 94%
From NCERT
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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

Subtopic:  DNA Replication:III | Transcription:II | DNA Replication | Transcription |
 78%
From NCERT
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