Question

Nitrogen base not present in DNA:

• A. Uracil
• B. Guanine
• C. Adenine
• D. Cyclosine

Hint:

Remember, uracil replaces thymine in RNA, while DNA contains thymine. Cyclosine is not a nitrogen base in either RNA or DNA.

Answer 1

The Correct Option is D

The nitrogenous bases present in DNA are adenine (A), guanine (G), cytosine (C), and thymine (T). Uracil (U) is a nitrogenous base found in RNA, not in DNA. Cyclosine, although sounding similar to cytosine, is not a known nitrogenous base in either RNA or DNA. Thus, Cyclosine is the nitrogen base not present in DNA.