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Which of the following ribosomes are engaged in protein synthesis in animal cell :
A
Ribosomes which occur on nuclear membrane and E.R.
B
Ribosomes of only cytosol
C
Ribosomes of only nucleolus and cytosol
D
Ribosomes of only mitochondria and cytosol
Detailed Solution
In an animal cell, protein synthesis takes place on ribosomes found free in the cytosol and bound to the rough endoplasmic reticulum and the outer nuclear membrane (which is continuous with the ER). Mitochondrial ribosomes also make a few proteins.
Ribosomes are assembled in the nucleolus but do not synthesise proteins there.
The option that correctly lists ribosomes engaged in protein synthesis, without wrongly restricting it, is the ribosomes on the nuclear membrane and ER.
So, as per the answer key, ribosomes that occur on the nuclear membrane and ER are engaged in protein synthesis.
Ribosomes are assembled in the nucleolus but do not synthesise proteins there.
The option that correctly lists ribosomes engaged in protein synthesis, without wrongly restricting it, is the ribosomes on the nuclear membrane and ER.
So, as per the answer key, ribosomes that occur on the nuclear membrane and ER are engaged in protein synthesis.