Multiple choice

Cytocine and guanine are held together by

  1. single hydrogen bond

  2. double hydrogen bond

  3. triple hydrogen bond

  4. None of these

Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Cytosine and guanine form three hydrogen bonds between their complementary bases in DNA. This triple bonding makes the C-G pair more stable and harder to separate than the A-T pair, which has only two hydrogen bonds. This difference in bonding strength affects DNA melting temperature and stability.

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