Which one of the following is correct structure for cytosine?
Biomolecules · Class 12 · JEE Main Previous Year Question
Which one of the following is correct structure for cytosine?
- a
Option a
- b
Option b
- c
Option c
- d✓
Option d
Option d
Step 1: Classification of Bases — Cytosine is one of the four main nitrogenous bases found in DNA and RNA, specifically categorized as a pyrimidine.
Step 2: Identifying the Pyrimidine Ring — It consists of a six-membered heterocyclic ring with an amino group at and a keto group at .
Step 3: Correct Match — Comparing the options to the chemical identity (4-amino-2-hydroxypyrimidine tautomer), structure (d) is the correct representation for cytosine.
Remember: In DNA, cytosine pairs with guanine via three hydrogen bonds.
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