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Answer on Molecular Biology Question for Briana Melton

Question #46565
What happens to proteins within the endoplasmic reticulum?

A.) They are synthesized.
B.) They are broken down.
C.) They are converted into lipids.
D.) They are modified by enzymes.

PLEASE HELP!! Thank you!
Expert's answer
The rough endoplasmic reticulum has ribosomes attached to the cytosolic surface, which are actively synthesizing proteins. Therefore, the rough ER is the major site where most cell-membrane proteins, as well as proteins destined for export to the lysosomes and from the cell, are made. This organelle is enormously enlarged in cells that are specialized for the secretion of proteins. Thus, the correct answer is A) proteins are synthesized. 

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