Question

The purine base present in RNA is

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

Answer 1

The correct option is A

Guanine

The correct option is A.

Explanation of the correct option:

1. Purines are carbon-containing compounds that are one of the two groups of compounds that are used to form the backbone of the DNA molecule.
2. Purine has two cycles a six-membered pyrimidine ring and a five-membered imidazole ring fused together. Four nitrogen atoms are present at the 1, 3, 7, and 9 positions.
3. The category of purines consists of two well-known compounds namely, adenine and guanine.
4. Guanine is present in RNA and DNA and it binds to cytosine with the help of three hydrogen bonds.

Explanation of the incorrect options:

Option B:

Thymine is a pyrimidine and it is only found in DNA.

Option C:

Cytosine is a pyrimidine and it can be found in both DNA and RNA. It binds to the purine called guanine.

Option D:

Uracil is a pyrimidine which is only present in RNA and it pairs with adenine.

Final answer: The purine base present in RNA is guanine.