A signal peptidase
a. removes a signal sequence from a polypeptide chain after it passes through a channel into the rough ER.
b. attaches a signal sequence to a growing polypeptide chain before it passes into the rough ER.
c. attaches an acetyl group to the 5? end of a polypeptide after removal of the initial methionine.
d. removes the initial methionine from a polypeptide chain.
Ans: a. removes a signal sequence from a polypeptide chain after it passes through a channel into the rough ER.
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