Which of the following organelles is NOT bounded by a membrane?
- A. Ribosome
- B. Lysosome
- C. Mitochondrion
- D. Golgi apparatus
Explanation
A ribosome is a complex of ribosomal RNA and protein with no surrounding membrane at all, which is why it is found in prokaryotes as well as eukaryotes. Lysosomes and the Golgi apparatus each have a single membrane, and mitochondria have two. Nucleoli and centrioles are the other common non-membranous structures.
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