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Assertion: Ribosomes are considered as the most primitive cell organelles. Reason: Ribosomes do not occur in all prokaryotic organisms.

A
Both Assertion and Reason are true and Reason is the correct explanation of Assertion
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B
Both Assertion and Reason are true but Reason is not the correct explanation of Assertion
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C
Assertion is true but Reason is false
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D
Both Assertion and Reason are false
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Solution

The correct option is B Assertion is true but Reason is false

The ribosomes occur in all cells both prokaryotic and eukaryotic cells with the exception of the mammalian RBCs. In prokaryotes, the ribosomes occur freely in the cytoplasm. In eukaryotic cells, the ribosomes either occur freely in the cytoplasm or remain attached to the outer surfaces of the endoplasmic reticulum and nuclear envelope. Ribosomes are considered as the primitive cell organelles.


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