NEET Botany Molecular Basis of Inheritance Questions Solved

NEET - 2006

One turn of the helix in a B-form DNA is approximately:

(1) 20 nm

(2) 0.34 nm

(3) 3.4 nm

(4) 2 nm

(3) B-DNA is helical structure with 20Å diameter and the distance between the two base pairs is 3.4 Å and there are 10 base pairs in each turn or pitch (one round). Hence, one turn of the helix is approximately 34 Å or 3.4 nm (10 Å = 1.0 nm)

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