Question

Why endoplasmicreticulum is having ribosomes on it?

Answer 1

SER smooth endoplasmic reticulum
RER rough endoplasmic reticulum
ribosomes are for assembly of the proteins

Answer 2

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Ribosomes on RER, which give RER its rough appearance, specialize in the synthesis of proteins that possess a signal sequence that directs them specifically to the ER for processing. Proteins synthesized by the RER have specific final destinations, such as the cell membrane, cell exterior, or the ER itself.

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