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def: enzymes that catalyze the transfer of phospholipids from one side of the monolayer to the other.

Info: flippases transfer specific phospholipids selectively, so that different types become concentrated in each monolayer.

Flippanses, however, are not the only way to produce asymmetry in lipid bilayers, glycolipds are another way.

Filopodium (chapter 17)

def: Long thing actin-containing extension on the surface of an animal cell. Sometimes has an eploratory function, as in a growth cone.

Flagellum (chapter 17)

def: Long, whip-like protrusion that drives a cell through a fluid medium by its beating. Eukaryotic flagella are longer versions of cilia; bacterial flagella are completely different, being smaller and simpler in construction.

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