Question

Which of the following bases is not present in DNA?

विकल्प

• Adenine

• Thymine

• Cytosine

• Uracil

Answer 1

Uracil

Explanation:

Uracil is rarely found in DNA, which could be an evolutionary adaptation to increase genetic stability. This is due to the fact that cytosine can deaminate spontaneously to produce uracil via hydrolytic deamination.

Chemical formula: C₄H₄N₂O₂