| Direction: Each of these questions contains two statements |
| Assertion [A] and Reason [R]. Each of these questions also has four alternative choices, any one of which is the correct answer. You have to select one of the codes [a], [b], [c] and [d] given below. |
| Assertion [A] DNA has two chains having antiparallel polarity. |
| Reason [R] In one chain of DNA at one end has a free phosphate moiety 3 end of ribose sugar and at other end the ribose has a free 3' OH group. |
A) Both A and Rare true and R is the correct explanation of A
B) Both A and R are true, but R is not the correct explanation of A
C) A is true, but R is false
D) A is false, but R is true
Correct Answer: A
Solution :
[a] Both A and R are true and R is the correct explanation of A. The two chains of DNA have antiparallel polarity. This is because one chain has a free phosphate moiety at the 5' end of the ribose sugar and another chain has a free phosphate moiety at the 3' end.
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