NEET Botany DNA Structure MCQ Question

A complete turn of the DNA helix occurs every 10 base pairs, with each base pair being 0.34 nm apart. Therefore, for 50 base pairs, the length is 50 x 0.34 nm = 17 nm. However, the question asks for the length of the segment including the turns, which is the distance for 5 turns: 5 x 3.4 nm = 17 nm. The correct calculation should yield 17 nm, not 34 nm. Correct answer is 17 nm.