IB Biology SL B2.2 Organelles and compartmentalization questions

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Question 1

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Following ultracentrifugation, a researcher tests separated cell components to relate their structures to their functions. Which component should be classified as an organelle?

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Answer: D. Organelles are discrete cell subunits adapted to perform specific functions; the plasma membrane is classified as an organelle.

A: treats the cytoplasm, which is not an organelle, as a discrete subunit.
B: confuses the cytoskeleton with an organelle; it is not classified as one.
C: treats the cell wall as an organelle, although it is not classified as one.
Remember: the plasma membrane is an organelle, but the cell wall, cytoskeleton and cytoplasm are not.

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