Question

Number of hydrogen bonds between A and T of DNA is

• A. 1
• B. 4
• C. 3
• D. 2

Answer 1

The correct option is D 2

Answer

Nitrogenous base pairs

. The nitrogenous bases of each strand of DNA are projected inwards and form a pair with the complementary base present on the opposite strand.

. A purine (Adenine or Guanine) always pairs with a pyrimidine (Cytosine and Thymine) with the help of hydrogen bonds.

. Adenine pairs with thymine using 2 hydrogen bonds.

. Cytosine pairs with guanine using 3 hydrogen bonds.

Answer
Final answer
c.2