One gene-one enzyme hypothesis was postulated by:

1. R. Franklin

2. Hershey and Chase

3. A. Garrod 

4. Beadle and Tatum

Subtopic:  Transcription: I | Transcription |
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NEET - 2006
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One turn of the helix in a B-form DNA is approximately:

(1) 20 nm

(2) 0.34 nm

(3) 3.4 nm

(4) 2 nm

Subtopic:  DNA Double Helix |
 73%
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NEET - 2006
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Antiparallel strands of a DNA molecule means that:

(1) one strand turns anti-clockwise

(2) the phosphate groups of two DNA strands, at their ends, share the same position

(3) the phosphate groups at the start of two DNA strands are in opposite position (pole)

(4) one strand turns clockwise

Subtopic:  DNA Double Helix |
 85%
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NEET - 2006
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Complete genomic sequence of the following plant has been recently announced is

(1) Arabidopsis thaliana

(2) Tritium vulgare

(3) Cucurbita pepo

(4) Pisum sativum

Subtopic:  Human Genome Project |
 64%
From NCERT
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Okazaki fragments are proportions of DNA

(1) synthesized on the leading strand of DNA replication fork

(2) synthesized on the lagging strand of DNA replication fork

(3) produced during the digestion of DNA by restriction endonucleases

(4) none of the above

Subtopic:  DNA Replication:III | DNA Replication |
 90%
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Transcription in case of eukaryotes takes place in

(1) nucleus

(2) nucleolus

(3) cytoplasm

(4) ribosome

Subtopic:  Transcription: IV | Transcription |
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Which of the following banding group is used in staining both plant and animal chromosome?

(1) C-group

(2) G-group

(3) R-group

(4) N-group

Subtopic:  DNA Packaging |
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Which of the following is nonsense codon?

(1) UAG

(2) UAA

(3) UGA

(4) all the above

Subtopic:  Genetic Code: III | Genetic Code |
 94%
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Frameshift mutation occurs when

(1) base is substituted

(2) base is deleted or added

(3) anticodons are absent

(4) none of these

Subtopic:  Genetic Code: II | Genetic Code |
 86%
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Wobble hypothesis was given by

(1) R.W. Holley

(2) M. Nirenberg

(3) H.G. Khorana

(4) F.H.C. Crick

Subtopic:  DNA Double Helix |
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