Discussion
A secretory protein spends 5 minutes in the endoplasmic reticulum, 20 minutes in the Golgi and 5 minutes in a vesicle. What fraction of its journey is spent in the Golgi?
Answer: A
The total journey is 30 minutes and 20 of them are spent in the Golgi, which is two thirds. Modifying and sorting take considerably longer than either synthesis or transport. Most of a secretory protein's life before release is spent being modified.
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