The endoplasmic reticulum (ER) is an organelle in some cells. In these cells, it

Question

The endoplasmic reticulum (ER) is an organelle in some cells. In these cells, it is continuous with the nuclear membrane and forms a large part of the cell's total membrane. Sort the phrases below as describing rough ER, smooth ER, both, or neither Note: If you answer any part of this question incorrectly, a single red X will appear indicating that one or more of the phrases are sorted incorrectly. Smooth ER Both Rough ER bound with ribosomes involved in protein synthesis protein-folding process Neither involved in lipid synthesis found in prokaryotes and eukaryotes occurs in lumen enclose the lumeninvolved in toxin (cisternal space) or drug metabolism "packages" enzymes in vesicles for secretion

Explanation / Answer

Ans:

Rough endoplasmic reticulum: Bound with ribosomes, involved in protein synthesis, protein-folding process occurs in lumen, enclose the lumen (cisternal space), packages enzymes in vesicles for secretion

Smooth ER: involved in lipid synthesis, involved in toxin or drug metabolism, found in prokaryote and eukaryotes

Rough and smooth ER found in eukaryotes

Ribosomes on the rough endoplasmic reticulum are called membrane bound and are responsible for the assembly of many proteins. This process is called translation.

Smooth ER is not studded with ribosomes hence smooth ER. The smooth ER is involved in the synthesis of lipids, including cholesterol and phospholipids, which are used in the production of new cellular membrane. In certain cell types, smooth ER plays an important role in the synthesis of steroid hormones from cholesterol. The smooth endoplasmic reticulum lacks surface ribosomes, synthesizes lipids, processes toxins and drugs in liver cells, and stores and releases calcium ions in muscle cells.

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