Which one of the following structures is an organelle within an organelle?
Correct answer: A. Ribosome
- A. Ribosome
- B. Peroxisome
- C. ER (Endoplasmic Reticulum)
- D. Mesosome
Explanation
Ribosomes are critical for protein synthesis and are unique because they can be found within mitochondria and chloroplasts, both of which have their own DNA and protein synthesis machinery, thus qualifying ribosomes as 'organelles within an organelle.' Peroxisomes, endoplasmic reticulum, and mesosomes do not have this characteristic, as they do not reside within other organelles.
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About Cell Structure and Function
Animal, plant, prokaryotic and eukaryotic cells are compared through their membranes, cell walls, nuclei and cytoplasmic organelles. The work includes the structures and functions of mitochondria, chloroplasts, ribosomes, endoplasmic reticulum, Golgi apparatus and lysosomes, as well as chromosome organization and the distinction between chromatin and chromosomes.
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