Which one of the following structures is an o | vedclass

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(A) : Ribosomes are found in all living cells except mammalian erythrocytes or red blood corpuscles.Depending upon their location,ribosomes are of two

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Ribosome

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(A) : Ribosomes are found in all living cells except mammalian erythrocytes or red blood corpuscles.Depending upon their location,ribosomes are of two types: cytoplasmic ribosomes and organelle ribosomes.Cytoplasmic ribosomes (cytoribosomes) may remain free in the cytoplasmic matrix or attached to the cytosolic surface of the endoplasmic reticulum with the help of special ribophorin or $SRP$ proteins.Organelle ribosomes are found within other organelles,specifically in plastids (plastiribosomes) and mitochondria (mitoribosomes).Cytoplasmic ribosomes are of the $80S$ type in eukaryotic cells,whereas organelle ribosomes are of the $70S$ type.

Which one of the following structures is an organelle within an organelle?

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