Question

Choose the correct answer from the alternatives given :
Given figure represents the DNA double helix model is proposed by Watson and Crick (1953). Select the option that shows correct measurements of A, B and C.

• A. A-3.4nm, B-0.34nm, C -2nm
• B. A-34 rim, B -3.4 nm, C - 20 nm
• C. A-3.4 $\dot{A}$, B-0.34 $\dot{A}$ , C-20 $\dot{A}$
• D. A-34 $\dot{A}$, B-3.4 $\dot{A}$, C-2 $\dot{A}$

Answer 1

The correct option is A A-3.4nm, B-0.34nm, C -2nm

The DNA helix makes one complete spiral turn every 3.4 nm and has a diameter of 2nm. The distance between adjacent stacks is 0.34 nm.