Home Chemistry Biomolecules Vitamins, Hormone and Nucleic Acid Which substance is not present in nucleic ac…
Chemistry Biomolecules Vitamins, Hormone and Nucleic Acid Single Correct MCQ
Published on: August 12, 2026

Which substance is not present in nucleic acid

A
Cytosine
B
Adenine
C
Thymine
D
Guanidine

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Text Solution

Verified by Experts
The correct answer is:
D

Guanidine is not present in nucleic acid and as cytosine, Adenine, Thymine and Guanine are the four main bases found in nucleic acid. Adenine and Guanine are purines while thymine and cytosine are pyrimidines. They together form triple bonded histones of DNA.

Guanidine is another compound which has a chemical formula .

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