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Q.

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

a, b, c correct

b

Only b, c correct

c

Only c correct

d

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 34A°. At each step of ascent, the strand turns 36°.

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In B – DNAa)    One full turn of helical strand has 10 stepsb)    Length of one full turn is 34Åc)    At each step, strand turns 36º