1.

In yeast cells, protein transport across the endoplasmic reticulum membrane occurs __________(a) perpendicularly(b) discontinuously(c) co-translationally(d) post-translationally

Answer» Correct choice is (d) post-translationally

Explanation: Polypeptide is synthesized in the ribosome and if appropriate signal is present in its C-terminal it moves to the ER membrane during the synthesis, this is called co-translational movement. In post-translational movement, the nascent polypeptide reaches the ER membrane after complete synthesis. Unlike mammalian cells post-translational movement of the polypeptides is observed in the yeast cells.


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