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translation of transmembrane proteins begins on ribosomes associated with the er.

Sagot :

On free ribosomes, protein translation starts for all proteins. Ribosomes of the rough ER are ribosomes that are connected to the endoplasmic reticulum and synthesize proteins for export through it.

What is Endoplasmic Reticulum ?

The cytoplasm's endoplasmic reticulum (ER), which extends from the nuclear membrane throughout the cytoplasm, is a network of tubules and sacs (cisternae) that are membrane-enclosed. The biggest organelle of the majority of eukaryotic cells, the endoplasmic reticulum is completely encircled by a continuous membrane. Its membrane could make up roughly half of all cell membranes, and the lumen, also known as the cisternal space, which the ER encloses, could make up roughly 10% of the volume of the entire cell. There are two main kinds of ER that carry out various tasks inside the cell, as will be covered further below. In order to digest proteins, the rough ER, which has ribosomes covering its exterior, is used. Involved in lipid metabolism rather than protein metabolism, the smooth ER is not connected to ribosomes.

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