Which of the following organelle is not enclosed by a membrane?
A
Ribosome
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B
Lysosome
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C
Vacuole
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D
Chloroplast
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Solution
The correct option is ARibosome Ribosomes are not bound by any membrane. They are either free-floating in the cytoplasm or are found attached to the membrane of rough endoplasmic reticulum. Their primary function is protein synthesis.