Which organelle contains its own DNA and ribosomes and can replicate independently of the cell?

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Multiple Choice

Which organelle contains its own DNA and ribosomes and can replicate independently of the cell?

Explanation:
The key idea is that some organelles are semi-autonomous because they carry their own genetic material and ribosomes, allowing them to grow and divide on their own. The mitochondrion has its own circular DNA and ribosomes, so it can synthesize some of its own proteins and replicate by binary fission inside the cell. This independence mirrors how bacteria reproduce, which fits with the endosymbiotic origin of mitochondria. In contrast, the nucleus houses the cell’s DNA but its replication is tightly coordinated with the cell cycle and relies on nuclear enzymes; the Golgi apparatus and lysosomes do not contain DNA or ribosomes of their own and depend on proteins produced elsewhere. Therefore, the organelle described is the mitochondrion.

The key idea is that some organelles are semi-autonomous because they carry their own genetic material and ribosomes, allowing them to grow and divide on their own. The mitochondrion has its own circular DNA and ribosomes, so it can synthesize some of its own proteins and replicate by binary fission inside the cell. This independence mirrors how bacteria reproduce, which fits with the endosymbiotic origin of mitochondria. In contrast, the nucleus houses the cell’s DNA but its replication is tightly coordinated with the cell cycle and relies on nuclear enzymes; the Golgi apparatus and lysosomes do not contain DNA or ribosomes of their own and depend on proteins produced elsewhere. Therefore, the organelle described is the mitochondrion.

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