Structure of Water and Hydrogen Bonding

AP Biology· difficulty 3/5

In an aqueous environment, hydrophobic amino-acid side chains tend to be located

  • A

    Exposed on the protein surface, in contact with water

  • B

    Always clustered along the central α-helix axis

  • C

    Concentrated near the N-terminus of the polypeptide

  • D

    Buried in the protein's interior, away from water

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Explanation

Burying hydrophobic side chains releases ordered water molecules, increasing entropy — the "hydrophobic effect" drives folding.

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