Why Is the ER Ideal as a Port of Entry

question 3

Multiple Choice

Why is the ER ideal as a port of entry for secretory proteins?

• A)The ER has a large surface area allowing for the attachment of many ribosomes.
• B)The ER cisternae lumen favors unfolding and disassembly of proteins.
• C)The RER can segregate secretory, lysosomal and cytoplasmic proteins from other newly made proteins, allowing their modification, and send them to their final destination.
• D)The ER has a small surface area, allowing critical peptides to be concentrated into vesicles.

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