NEET · BiologyMedium
Which of the following statements regarding the structure of DNA is correct according to the Watson-Crick model?
- A.The two strands run in parallel to directions.
- B.The nitrogenous bases are projected perpendicular to the backbone and face inside.
- C.The pitch of the helix is .
- D.Adenine pairs with Guanine through three hydrogen bonds.
Show correct answer & step-by-step solution
Correct answer: B — The nitrogenous bases are projected perpendicular to the backbone and face inside.
Solution
- DNA strands are antiparallel, not parallel.
- The pitch of the helix is , not .
- Adenine pairs with Thymine via two hydrogen bonds.
- Nitrogenous bases are perpendicular to the backbone and face inward.
- Hence the answer is (B).
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