Which of the following contains its own DNA and ribosomes?

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BlackTom AI · Accepted Answer

Question: Which of the following contains its own DNA and ribosomes? Options: Mitochondrion, Golgi, Lysosome, Centriole, Virus.
Option 1: Mitochondrion. This is correct because mitochondria are organelles that carry their own circular DNA and their own ribosomes, supporting the endosymbiotic theory that they originated from free-living bacteria. This autosomal genetic material and protein-synthesis machinery allow mitochondria to produce some of their own proteins.
Option 2: Golgi. The Golgi apparatus functions in modifying, sorting, and shipping proteins, but it does not contain DNA and lacks ribosomes of its own. It relies on nuclear-encoded proteins synthesized on cytosolic ribosomes.
Option 3: Lysosome. Lysosomes are membrane-bound organelles containing digestive enzymes. They do not have their own DNA, and they rely on enzymes synthesized elsewhere in the cell; they do not possess ribosomes.
Option 4: Centriole. Centrioles are microtubule-based structures involved in organizing spindle fibers during cell division. They do not contain DNA or ribosomes and do not perform protein synthesis.
Option 5: Virus. Some viruses have DNA (or RNA) but they do not contain their own ribosomes and cannot perform protein synthesis independently; they hijack the host cell’s ribosomes. Therefore, they do not meet the criterion of having their own DNA and ribosomes.
In summary, only the mitochondrion fits the criterion of possessing its own DNA and ribosomes, reflecting its semi-autonomous, endosymbiotic origin.

Which of the following contains its own DNA and ribosomes?单项选择题

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