Most proteins destined to enter the endoplasmic reticulum . Group of answer choices are transported across the membrane after their synthesis is complete. are synthesized on free ribosomes in the cytosol. begin to cross the membrane while still being synthesized. remain within the endoplasmic reticulum.

Begin to cross the membrane while still being synthesized-C

Explanation:

The Endoplasmic Reticulum is a part of the endomembrane system of the cell which is mostly reponsible for the synthesis and modification of proteins, although synthesis of lipids in plant and animal are carried out here

For more synthesis of proteins, it

needs to be further transported into the Rough endoplasmic reticulum- the designated site for secretion after synthesis of proteins.

Also it has been found out that when this proteins enter the Endoplasmic Reticulum, they start to cross the membrane while still being synthesized.

Begin to cross the membrane while still being synthesized.

Explanation:

Endoplasmic reticulum is a very essential organelle that is found in cells. It plays a very important role in the synthesis and transportation of proteins. Endoplasmic recticulum is found in cells that have a true nucleus(eukaryotic cells), it is not found in prokaryotes.

The synthesis of proteins that enters into the endoplasmic reticulum is created on free ribosomes. A targeting series of hydrophobic amino acids that is located near the amino terminal end of the developing polypeptide will result in uniting the ribosome to the endoplasmic recticulum membrane.

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