Directions : In the following question more than one of the answers given may be correct. Select the correct answer and mark it according to the code:
DNA can be (1) \[\text{A-DNA}\] (2) \[\text{B-DNA}\] (3) \[\text{Z-DNA}\] (4) \[\text{Y-DNA}\]A) 1, 2 and 3 are correct.
B) 1 and 2 are correct.
C) 2 and 4 are correct.
D) 1 and 3 are correct.
Correct Answer: A
Solution :
DNA can exist in the A, B, C and D forms. Sugar puckering is the most important characteristic for distinguishing the DNA forms. The A-form has 3'-endo puckering, the B and C forms 3'-exo puckering and the D-form 2'-endo puckering, According to G A Rodley eral, and V Sasisekhara et al, an another form of DNA Z-DNA is also present.
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