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 |
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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 |
 79%
From NCERT
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What defines a coding and a template strand in the transcription unit?

(1) Structural gene

(2) Ori

(3) Terminator

(4) Promoter

Subtopic:  Transcription:II | Transcription |
 68%
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A segment of DNA coding for a polypeptide is most accurately defined as:

(1) Operon

(2) Gene

(3) Recon 

(4) Cistron

Subtopic:  Transcription: III | Transcription |
 75%
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In eukaryotes the sequences that appear in mature or processed mRNA are called:

(1) Introns

(2) Cistrons

(3) Exons

(4) Mutons

Subtopic:  Transcription: III | Transcription |
 83%
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What facilitates the opening of the helix during elongation step of transcription?

(1) RNA polymerase

(2) Helicase

(3) Topoisomerase

(4) Gyrase

Subtopic:  Transcription: III | Transcription |
 57%
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Which of the following helps in termination of transcription?

(1) Sigma factor

(2) Translocase

(3) Ubiquitin

(4) Rho factor

Subtopic:  Transcription: III | Transcription |
 93%
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