Question

Which of the following is not present in RNA?

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

Hint:

Remember: DNA contains Thymine, while RNA contains Uracil. This is a key difference between these nucleic acids.

Answer 1

The Correct Option is C

RNA (Ribonucleic Acid) differs from DNA in its nucleotide composition. The nitrogenous bases in RNA include: Adenine (A), Guanine (G), Cytosine (C), Uracil (U). 

Thymine (T) is not present in RNA. Instead, Uracil (U) takes its place and pairs with Adenine during transcription. 

Key Points: Thymine is exclusively found in DNA. Uracil is specific to RNA and is chemically similar to Thymine but lacks a methyl group. Thus, the correct answer is Thymine.