MCAT Biology Question 6: Answer and Explanation
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Question: 6
6. Which of the following is NOT a function of the smooth endoplasmic reticulum?
- A. Lipid synthesis
- B. Poison detoxification
- C. Protein synthesis
- D. Transport of proteins
Correct Answer: C
Explanation:
The smooth endoplasmic reticulum is involved in the transport of materials throughout the cell, in lipid synthesis, and in the detoxification of drugs and poisons. Proteins from the rough ER can cross into the smooth ER, where they are secreted into cytoplasmic vesicles and transported to the Golgi apparatus. Thus, from the given choices, protein synthesis is not a function of the smooth ER, but rather of the free ribosomes or the ribosomes associated with the rough ER. Choice (C) is therefore the correct answer.