Question

.......... base is found in RNA but not in DNA.

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

Answer 1

The correct option is A Uracil

Uracil is among the five nitrogenous bases like adenine, guanine, cytosine, and thymine,but is only found in RNA. It is a naturally occurring pyrimidine derivative with the molecular formula C₄H₄N₂O₂. Uracil is planar and unsaturated and has the ability to absorb light. It binds to adenine via 2 hydrogen bonds but is replaced by thymine in DNA.

So, the correct answer is option A.