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What is the width of the DNA double helix?(a) 1 nm(b) 2 nm(c) 3 nm(d) 4 nmThe question was posed to me during an online exam.This intriguing question comes from Gene Chemical Nature in division Nature of Genome of Cell Biology

Answer»

Right answer is (b) 2 nm

To explain: The distance from the PHOSPHORUS ATOM of the backbone to the center of the axis of molecule is 1 NANOMETER (1 nm = 10^-9m). The entire width of the double HELIX is 2 nm.



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