Vocabulary

phospholipid bilayer chromosome nuclear envelope nucleolus ribosome mitochondrion endoplasmic reticulum

Golgi apparatus lysosome cytoskeleton microtubule microfilament cilium flagellum centriole

Phospholipid bilayer

Polar Nonpolar

Polar

The phospholipid bilayer is the foundation of the cell membrane.

The arrangement of phospholipids in the bilayer makes the cell membrane selectively permeable.

figure 4-10

Cell membranes are made of a phospholipid bilayer. Each phospholipid molecule has a polar "head" and a two-part nonpolar "tail."

figure 4-10

Cell membranes are made of a phospholipid bilayer. Each phospholipid molecule has a polar "head" and a two-part nonpolar "tail."

Polar Nonpolar

Polar

A phospholipid's "head" is polar, and its two fatty acid "tails" are nonpolar.

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