Which one of the following cell organelles is enclosed by a single membrane?
| 1. | Nuclei | 2. | Mitochondria |
| 3. | Chloroplasts | 4. | Lysosomes |

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A cell organelle containing hydrolytic enzymes is
| 1. | mesosome | 2. | lysosome |
| 3. | microsome | 4. | ribosome |

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