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Which one of the following structures is an organelle within an organelle?
A
Mesosome
B
Ribosome
C
Peroxisome
D
ER
Detailed Solution
Ribosomes are present not only in the cytoplasm and on the rough ER but also inside two other organelles, the mitochondria and the chloroplasts.
The matrix of mitochondria and the stroma of chloroplasts contain their own 70S ribosomes for protein synthesis.
Thus the ribosome is described as an organelle within an organelle.
A mesosome is an infolding of the bacterial plasma membrane, while peroxisomes and ER lie freely in the cytoplasm and are not found inside another organelle.
Hence the answer is the ribosome.
The matrix of mitochondria and the stroma of chloroplasts contain their own 70S ribosomes for protein synthesis.
Thus the ribosome is described as an organelle within an organelle.
A mesosome is an infolding of the bacterial plasma membrane, while peroxisomes and ER lie freely in the cytoplasm and are not found inside another organelle.
Hence the answer is the ribosome.