Practice MCAT Question - Q69 - Answer!
Which of the following organelles are not associated with the breakdown of potentially harmful substances?
A. Lysosomes
B. Peroxisomes
C. Smooth ER
D. Rough ER
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The correct answer is (D). Rough ER is primarily responsible for synthesizing membrane proteins and secretory proteins. Peroxisomes break down hydrogen peroxide and other toxins, smooth ER plays a role in drug detoxification, and lysosomes break down various molecules that originate inside and outside the cell.
