| I. Base composition of DNA varies from one species to another. |
| II. Z-DNA is a right handed helix. |
| III. Prokaryotic genomic DNA and many viral DNAs are circular molecules. |
| IV. Hershey and Chase experiments observed the transformation in mice. |
A) I and II
B) II and III
C) II and IV
D) All of these
Correct Answer: C
Solution :
The correct statements are II. Z-DNA is a left-handed helix and has a zig-zag appearance. It contain 12 base pairs per turn of the helix. IV. In 1952, Hershey and Chase performed experiments with viruses to proof that DNA is the basic hereditary material.
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