Round 5: Tossup 13

Binding of the Hrs protein to ubiquitin and Pl(3)P stimulates this process by kickstarting the ESCRT (“escort”) complex. (-5[1])After AP2 binds to a tyrosine-laden motif on a cytoplasmic “tail,” it recruits a triskelion-shaped molecule that mediates (15[1]-5[1])this process. (15[1])This process can occur through caveolae, but its most common type is receptor-mediated, taking place through pits coated with (*) clathrin. The “late” product of this process undergoes fusion with the lysosome. (0[1])This process involves stabilization of membrane curvature and the formation of vesicles. For 10 points, name this process in which a cell takes up molecules in contrast to exocytosis. ■END■ (10[1])

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