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12. Which of the following organelles is not a membranous structure?

A. Ribosome
B. Mitochondrion
C. Nucleus
D. Smooth endoplasmic reticulum


Sagot :

Final answer:

The ribosome is an organelle within a eukaryotic cell that is not a membranous structure.


Explanation:

Ribosome is the organelle that is not a membranous structure. Ribosomes are responsible for protein synthesis in cells and consist of RNA and proteins but do not have a membrane surrounding them.


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