Based on the descriptions given, the accurate statement concerning the structures within the cell would be:
Structure 3 is a mitochondrion, where cellular respiration takes place.
Here’s a breakdown of why the other statements are not accurate:
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Structure 1 is a chloroplast that carries out photosynthesis: This statement is incorrect because chloroplasts are not found in human cells; they are present in plant cells.
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Structure 2 is a vacuole that contains DNA: This statement is also incorrect; vacuoles do not contain DNA. In animal cells, vacuoles are generally smaller and mainly serve as storage for nutrients and waste products, while DNA is housed within the nucleus.
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Structure 4 is the cell membrane, which provides rigid, inflexible support for the cell: This statement is inaccurate because while the cell membrane does provide structure and support, it is not rigid and inflexible; rather, it is semi-permeable and flexible, allowing the cell to change shape.
Thus, the only accurate statement is that Structure 3 is the mitochondrion, where cellular respiration takes place.