Question:
In one helix of DNA, minimum and maximum number of hydrogen bonds present between nitrogen bases:
In one helix of DNA, minimum and maximum number of hydrogen bonds present between nitrogen bases:
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DNA base pairing follows Chargaff’s rule:
A pairs with T (2 bonds), and G pairs with C (3 bonds).
A pairs with T (2 bonds), and G pairs with C (3 bonds).
Updated On: Mar 11, 2025
- 20 and 20
- 20 and 30
- 30 and 20
- 30 and 40
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The Correct Option is B
Solution and Explanation
Step 1: Understanding Hydrogen Bonds in DNA
DNA consists of two strands forming a double helix, where nitrogenous bases pair via hydrogen bonds:
- Adenine (A) pairs with Thymine (T) → 2 hydrogen bonds
- Guanine (G) pairs with Cytosine (C) → 3 hydrogen bonds Step 2: Calculating Hydrogen Bonds in One Helix - The minimum number of hydrogen bonds (when more A-T pairs exist) is 20.
- The maximum number of hydrogen bonds (when more G-C pairs exist) is 30. Step 3: Identifying the Correct Answer Correct answer: 20 and 30 hydrogen bonds in one helix.
- Adenine (A) pairs with Thymine (T) → 2 hydrogen bonds
- Guanine (G) pairs with Cytosine (C) → 3 hydrogen bonds Step 2: Calculating Hydrogen Bonds in One Helix - The minimum number of hydrogen bonds (when more A-T pairs exist) is 20.
- The maximum number of hydrogen bonds (when more G-C pairs exist) is 30. Step 3: Identifying the Correct Answer Correct answer: 20 and 30 hydrogen bonds in one helix.
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