20 . 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? １in the aqueous interior of a lysosome functioning as a digestive enzyme ２in the cytoplasm, functioning as an enzyme in carbohydrate synthesis ３embedded in the plasma membrane functioning in the transport of molecules into the cell ４in the internal space of the Golgi apparatus, being modified before the protein is excreted ５in a mitochondrion functioning in ATP synthesis -- 陈金锋你是最强的^.^ 爱死你了!!! --

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