Which of the following is true of the endoplasmic reticulum?
BIOLOGY
SAT 2021
Which of the following is true of the endoplasmic reticulum?
- A. The endoplasmic reticulum is made up of membrane-enclosed spaces used for the trafficking of materials.
- B. The endoplasmic reticulum functions in the transport of materials destined to be endocytosed into the cell.
- C. Both the smooth and rough ER are directly involved in protein synthesis.
- D. The rough ER is involved in metabolism and lipid synthesis.
Correct Answer: A. The endoplasmic reticulum is made up of membrane-enclosed spaces used for the trafficking of materials.
Explanation
The endoplasmic reticulum is made up of membrane-enclosed spaces used for the trafficking of materials that will be secreted from the cell. Therefore it is involved in exocytosis, not endocytosis. The smooth ER is involved in metabolism and lipid synthesis. The rough ER contains ribosomes accounting for its rough appearance and allowing it to be involved in protein synthesis.
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