Question:
In DNA, adenine normally pairs with
In DNA, adenine normally pairs with
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Remember: Adenine pairs with Uracil in RNA, but in DNA, it always pairs with Thymine.
Updated On: Jul 9, 2026
- \( \text{Cytocine} \)
- \( \text{Guanine} \)
- \( \text{Uracil} \)
- \( \text{Thymine} \)
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The Correct Option is D
Solution and Explanation
Concept:
The double-helix structure of DNA is maintained by specific hydrogen bonding between nitrogenous bases.
• This is known as complementary base pairing.
• Chargaff's rules state that certain bases always pair together in specific ratios.
Step 1: DNA Base Pairing Rules.
In the DNA molecule, a purine always pairs with a pyrimidine. Specifically, Adenine (A) always pairs with Thymine (T). Guanine (G) always pairs with Cytosine (C).
Step 2: Hydrogen Bond count.
Adenine and Thymine are held together by two hydrogen bonds. (In contrast, Guanine and Cytosine are held together by three hydrogen bonds).
• This is known as complementary base pairing.
• Chargaff's rules state that certain bases always pair together in specific ratios.
Step 1: DNA Base Pairing Rules.
In the DNA molecule, a purine always pairs with a pyrimidine. Specifically, Adenine (A) always pairs with Thymine (T). Guanine (G) always pairs with Cytosine (C).
Step 2: Hydrogen Bond count.
Adenine and Thymine are held together by two hydrogen bonds. (In contrast, Guanine and Cytosine are held together by three hydrogen bonds).
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