Question:
In double strand helix structure of DNA, heterocyclic base cytosine forms hydrogen bond with
In double strand helix structure of DNA, heterocyclic base cytosine forms hydrogen bond with
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C pairs with G via 3 hydrogen bonds → strongest DNA pairing.
Updated On: May 2, 2026
- Adenine
- Guanine
- Purine
- Thymine
- Uracil
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Verified By Collegedunia
The Correct Option is B
Solution and Explanation
Concept: Base pairing in DNA
---
Step 1: DNA base pairing rules
According to Watson-Crick model:
• Adenine (A) pairs with Thymine (T)
• Cytosine (C) pairs with Guanine (G) ---
Step 2: Hydrogen bonding
• A–T → 2 hydrogen bonds
• C–G → 3 hydrogen bonds (stronger pair) ---
Step 3: Identify correct pair
Cytosine always pairs with: \[ \text{Guanine} \] --- Final Answer: \[ \boxed{\text{Guanine}} \]
---
Step 1: DNA base pairing rules
According to Watson-Crick model:
• Adenine (A) pairs with Thymine (T)
• Cytosine (C) pairs with Guanine (G) ---
Step 2: Hydrogen bonding
• A–T → 2 hydrogen bonds
• C–G → 3 hydrogen bonds (stronger pair) ---
Step 3: Identify correct pair
Cytosine always pairs with: \[ \text{Guanine} \] --- Final Answer: \[ \boxed{\text{Guanine}} \]
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