QUESTION $4$

Consider a protein that is made in the rough endoplasmic reticulum. You observe that when the synthesis of the protein is completed, the protein is located in the ER membrane. Where else in the cell might this protein be found?

embedded in the plasma membrane functioning in the transport of molecules into the cell

in a mitochondrion functioning in ATP synthesis

in the aqueous interior of a lysosome functioning as a digestive enzyme

in the internal space of the Golgi apparatus, being modified before the protein is excreted

in the cytoplasm functioning as an enzyme in carbohydrate synthesis