Practice question
Question
An organelle is double-membrane-bound and contains circular DNA and 70S ribosomes. Its internal membranous sacs bear pigments, while its surrounding matrix contains enzymes for carbohydrate synthesis. Which organelle is it?
Explanation
Both mitochondria and chloroplasts contain circular DNA and 70S ribosomes, so those features alone do not distinguish them. Pigment-bearing thylakoids and enzymes for carbohydrate synthesis in the stroma identify the organelle as a chloroplast.
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