Structure and Function of Biological Macromolecules

AP Biology· difficulty 2/5

heads tails

The arrangement shown — hydrophilic heads facing outward and hydrophobic tails facing inward — is the basis of

  • A

    Cell-membrane phospholipid bilayer

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  • B

    Cellulose microfibril cell-wall layer

  • C

    Globular protein folded in cytoplasm

  • D

    Double helix of nucleic-acid strands

Explanation

Amphipathic phospholipids spontaneously self-assemble into a bilayer in aqueous environments — the structural foundation of all biological membranes.

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