Question

Which of the following represents double stranded helix structure of DNA?

• A.
• B.
• C.
• D.

Hint:

Remember, accurate base pairing is crucial for DNA replication and transcription processes, ensuring genetic fidelity across generations.

Answer 1

The Correct Option is B

Step 1: Review base pairing rules.

In DNA, adenine (A) always pairs with thymine (T), and guanine (G) always pairs with cytosine (C). This is known as complementary base pairing, which is essential for the stability of the DNA double helix.

Step 2: Analyze the provided diagrams.

Option (1) and (3) display incorrect or non-standard base pairing, not consistent with the Watson-Crick model of DNA.

Option (4) represents RNA pairings, which involve uracil instead of thymine.

Conclusion: Only option (2) accurately represents the double-stranded helix structure of DNA with correct base pairings.