Proteins that are moved into the endoplasmic reticulum (ER) are Group of answer choices fully synthesized...

Proteins that are moved into the endoplasmic reticulum (ER) are

Group of answer choices

fully synthesized in the cytoplasm and then moved into the ER.

fully folded when they are transported into the ER.

further modified within the ER.

will eventually move to the nucleus.

Expert Solution

The correct option is option C. further modified within the ER. The proteins are modified within the ER and sent to particular target sites such as to golgi bodies (if it has to be secreted outside the cell in the form enzymes/vesicles) or sent into the cytoplasm or remain in the ER itself. Several processes such as folding, formation of additional bonds, assembly into multisubunit complexes, glycosylation etc. occur within the ER.

The first option is wrong in that protein synthesis occurs in the ribosomes that are present in the cytoplasm outside the nucleus often found associated with them. The second option is wrong in that the folding and further processing of proteins occur within the ER. The fourth option is also incorrect because not all proteins move into the nucleus following processing in the ER. The 'eventually' in the option seems to suggest that the proteins formed in the ER ultimatley move into the nucleus, which is not true. The proteins are sent to their target sites/intended sites upon modification within the ER.

gladiator answered 2 years ago

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