One gene-one enzyme hypothesis was postulated by:

1. R. Franklin

2. Hershey and Chase

3. A. Garrod 

4. Beadle and Tatum

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

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

Complete genomic sequence of the following plant has been recently announced is

(1) Arabidopsis thaliana

(2) Tritium vulgare

(3) Cucurbita pepo

(4) Pisum sativum

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

Transcription in case of eukaryotes takes place in

(1) nucleus

(2) nucleolus

(3) cytoplasm

(4) ribosome

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

Which of the following is nonsense codon?

(1) UAG

(2) UAA

(3) UGA

(4) all the above

Frameshift mutation occurs when

(1) base is substituted

(2) base is deleted or added

(3) anticodons are absent

(4) none of these

Wobble hypothesis was given by

(1) R.W. Holley

(2) M. Nirenberg

(3) H.G. Khorana

(4) F.H.C. Crick