NEET · BiologyHard
Which of the following statements regarding the structure of B-DNA is correct concerning the helical parameters?
- A.The distance between two adjacent base pairs is and the pitch of the helix is .
- B.The distance between two adjacent base pairs is and the pitch of the helix is .
- C.The diameter of the helix is and there are base pairs per turn.
- D.The helix is left-handed with arise per base pair of .
Show correct answer & step-by-step solution
Correct answer: A — The distance between two adjacent base pairs is and the pitch of the helix is .
Solution
- B-DNA is a right-handed double helix structure.
- The pitch of one complete turn is .
- There are base pairs per turn in B-DNA.
- The distance between adjacent base pairs is calculated as .
- Hence the answer is (A).
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