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Which one of the following cell organelles is enclosed by a single membrane?

1. Mitochondria
2. Chloroplasts
3. Lysosomes
4. Nuclei

Correct answer: Lysosomes

Solution

Lysosomes are membrane-bound sacs containing digestive enzymes, and they are enclosed by a single membrane. In contrast, mitochondria, chloroplasts, and nuclei are all surrounded by double membranes.

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