Which of the Following Statements is Not True of the Endoplasmic

Question

Which of the following statements is not true of the endoplasmic reticulum?
A) It often constitutes more than half of the cell's total membrane
B) It exists in two forms: rough and smooth
C) Rough ER is responsible for protein synthesis
D) Smooth ER is responsible for lipid synthesis
E) Rough ER ribosomes are responsible for biotransformation.

Accepted Answer

Rough ER ribosomes are primarily responsible for protein synthesis, not biotransformation. Biotransformation processes, involving the modification of molecules, are more associated with the smooth ER and other cellular components like the cytochrome P450 enzymes in the liver.