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Which one of the following structures is an organelle within an organelle?

1. Ribosome
2. Peroxisome
3. ER
4. Mesosome

Correct answer: Ribosome

Solution

Ribosomes are small particles that can be found free in the cytoplasm or bound to the rough endoplasmic reticulum, so they are often described as an organelle within an organelle. The other options are membrane-bound organelles or a bacterial membrane infolding, not this nested arrangement.

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