Question

Which of the following is not present in a nucleotide?

• A. Guanine
• B. Cytosine
• C. Adenine
• D. Tyrosine

Hint:

Nucleotides contain a nitrogenous base (adenine, guanine, cytosine, thymine, or uracil), a phosphate group, and a sugar, but do not contain amino acids like tyrosine.

Answer 1

The Correct Option is D

Step 1: Nucleotides are the building blocks of nucleic acids, consisting of three components: a nitrogenous base (purine or pyrimidine), a phosphate group, and a sugar (either ribose or deoxyribose).
Step 2: The nitrogenous bases found in nucleotides include purines such as adenine (A) and guanine (G), and pyrimidines such as cytosine (C) and thymine (T) (in DNA) or uracil (U) (in RNA).
Step 3: Tyrosine is an amino acid, not a nitrogenous base, so it is not part of a nucleotide.