In B – DNA
a)    One full turn of helical strand has 10 steps
b)    Length of one full turn is 34Å
c)    At each step, strand turns 36º

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a, b, c correct

Only b, c correct

Only c correct

Only a, b correct

answer is D.

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Detailed Solution

In B-DNA, there are ten base pairs present in a full turn of helical strand. Length of each turn is 34 $\overset{°}{A}$ . At each step of ascent, the strand turns 36°.

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