Multiple choice

The two strands of the DNA molecule are held together by:

  1. phosphate bond

  2. amino bond

  3. hydrogen bond

  4. nitrogen bond
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

DNA's double helix structure is maintained by hydrogen bonds between complementary base pairs on opposite strands. Adenine pairs with thymine (2 hydrogen bonds), and guanine pairs with cytosine (3 hydrogen bonds). These bonds are strong enough to hold the strands together but weak enough to separate during DNA replication and transcription.

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