Previous year MCQs

General science UPPSC 1994 GS-I
Question

Which compound present in D.N.A. does not form amino acid?

1) Adenine
2) Tyrosine
3) Guanine
4) Cystosine

Answer & Solution

Answer: (Detailed Solution Below)

Option B: 1 and 3

Detailed Solution:

The correct answer is “1 and 3”.
DNA is made up of four building blocks called nucleotides: adenine (A), thymine (T), guanine (G), and cytosine (C). The nucleotides attach to each other (A with T, and G with C) to form chemical bonds called base pairs, which connect the two DNA strands.

Tyrosine is an amino acid, not a component of DNA. It is one of the 20 standard amino acids that are used by cells to synthesize proteins.

Tyrosine and cysteine are amino acids, while guanine, like adenine, is a nitrogenous base.

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