DNA and RNA Structure

AP Biology· difficulty 2/5

The double helix shown has antiparallel sugar-phosphate backbones with base pairs (A=T, G\equivC) connected by

A
$Disulfide bridges$
B
$Ionic bonds$
C
$Hydrogen bonds$
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D
$Covalent bonds$

Explanation

A=T (2 H-bonds), G\equivC (3 H-bonds). The hydrogen bonding is what allows strands to separate easily during replication and transcription while remaining stable at body temperature.

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