Discussion
A vesicle of surface area 0.5 square micrometres fuses with the plasma membrane. If 40 such vesicles fuse, how much membrane area is added?
Answer: B
Forty vesicles at half a square micrometre each contribute twenty square micrometres. A secretory cell must retrieve membrane by endocytosis at a matching rate, or its surface would grow steadily larger while its volume stayed the same.
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