Discussion
Consider the following statements about lysosomes.
1. They contain hydrolytic enzymes active at acid pH.
2. Their contents are separated from the cytosol by a membrane.
3. Their enzymes are synthesised on free cytosolic ribosomes.
Answer: A
The first two are correct and together explain why a cell can hold such destructive enzymes safely. The third is wrong, since these enzymes carry signal sequences and are made on the rough reticulum. They travel the secretory route and are diverted at the trans Golgi network.
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