Question

B-DNA which is right-handed double helix contains ______ base pairs per turn of the helix and each turn is _______ long.

• A. 10, 3.4 $\mathring{A}$
• B. 10, 34 $\mathring{A}$
• C. 11, 20 $\mathring{A}$
• D. 11, 34 $\mathring{A}$

Answer 1

The correct option is B 10, 34 $\mathring{A}$

B-DNA is the most commonly found form of DNA in nature. This form of DNA is very narrow and elongated.

B-DNA contains 10 base pairs per turn and each turn is about 34 Å long.

So, the correct answer is '10, 34 Å'