Which structure is non-membranous?

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Multiple Choice

Which structure is non-membranous?

Explanation:
Non-membranous structures are not enclosed by a lipid membrane. Ribosomes fit this description: they are small RNA–protein particles that float freely in the cytosol or attach to the rough endoplasmic reticulum, and they are not surrounded by a membrane. They function to synthesize proteins by translating mRNA. In contrast, the Golgi apparatus, lysosomes, and mitochondria are all enclosed by membranes (Golgi has membrane-bound sacs, lysosomes are membrane-bound organelles with enzymes, and mitochondria have a double membrane with internal folds). So the structure that is non-membranous is the ribosome.

Non-membranous structures are not enclosed by a lipid membrane. Ribosomes fit this description: they are small RNA–protein particles that float freely in the cytosol or attach to the rough endoplasmic reticulum, and they are not surrounded by a membrane. They function to synthesize proteins by translating mRNA. In contrast, the Golgi apparatus, lysosomes, and mitochondria are all enclosed by membranes (Golgi has membrane-bound sacs, lysosomes are membrane-bound organelles with enzymes, and mitochondria have a double membrane with internal folds). So the structure that is non-membranous is the ribosome.

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