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They serve as synthesizer, sorter, and transporter of materials such as protein and lipids

Sagot :

Answer:

(A, Richard Rodewald, University of Virginia/Biological Photo Service; B, Dan ... ER is not associated with ribosomes and is involved in lipid, rather than protein, ... In mammalian cells, most proteins are transferred into the ER while they are ... of mRNAs encoding secreted proteins, such as immunoglobulins (Figure 9.5).

Explanation: