Question

The dimensions of B-DNA are:

• A. Width 13.7 Å and length 24 Å
• B. Width 17.7 Å and length 30 Å
• C. Width 21.7 Å and length 32 Å
• D. Width 23.7 Å and length 34 Å

Hint:

B-DNA dimensions:
Width: 23.7 Å.
Pitch: 34 Å.
Rise per base pair: 3.4 Å.

Answer 1

The Correct Option is D

Step 1: Understanding the Concept:
DNA has specific dimensions.
These dimensions are determined by X-ray crystallography.

Step 2: Key Formula or Approach:
No specific formula.
Need to know the dimensions of B-DNA.

Step 3: Detailed Explanation:
B-DNA has a width (diameter) of approximately 23.7 Å.
The helical rise per base pair is about 3.4 Å.
The pitch (length of one complete turn) is 34 Å (10 base pairs).
Thus, the dimensions are width 23.7 Å and length (pitch) 34 Å.

Step 4: Final Answer:
The dimensions of B-DNA are width 23.7 Å and length 34 Å.
Hence, the correct option is (D).