A type of cell called a lymphocyte makes proteins that are exported from the cell. It is possible to tract the path of these proteins within the cell by labeling them with radioactive isotopes. Which of the following might be the path of the protein from the site where its polypeptides are made to the lymphocyte’s plasma membrane?

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SER → Lysosome → Plasma membrane

Nucleus → Golgi body → RER → Plasma membrane

Golgi body → RER → Plasma membrane

RER → Golgi body → Plasma membrane

answer is A.

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Detailed Solution

Proteins synthesised by ribosomes on the endoplasmic reticulum are modified in the cisternae of the golgi apparatus before they are released from its trans face. The golgi apparatus principally performs the function of packaging materials, to be delivered either to the intra-cellular targets or secreted outside the cell.
Therefore, path of the protein from the site where polypeptides are made is as follows:
RER $\to$ Golgi $\to$ Plasma membrane

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