Question

Which one is the correct base pairing for DNA molecule?

• A. Adenine-Thymine
• B. Thymine-Guanine
• C. Cytosine- Uracil
• D. Thymine- Uracil

Answer 1

The correct option is A

Adenine-Thymine

The correct option is A.

Explanation of correct option:

Option A

1. DNA molecules consist of four nucleotides - adenine, guanine, cytosine, and thymine.
2. Base pairing in the presence of hydrogen bonding.

• Adenine - Thymine
• Guanine - Cytosine

Explanation of incorrect option:

Option B

Thymine pairs with adenine by using two hydrogen bonds.

Option C

Cytosine pairs with guanine by using three hydrogen bonds.

Option D

In RNA, adenine always pairs with uracil.

Final answer: Adenine-Thymine is the correct base pairing for DNA molecules.