Q.

For transmembrane movement, which is TRUE?

A. exocytosis requires Ca2+ and energy
B. Na+ -K+ -ATPase is an example of facilitated diffusion
C. amiloride activates epithelial Na+ channels
D. clathrin is essential for vesicle exocytosis
E. water can only enter cells via water channels
Answer» A. exocytosis requires Ca2+ and energy
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