NEET 2000 Biology question

Which of the following ribosomes are engaged in protein synthesis in animal cell :

(1)Ribosomes which occur on nuclear membrane and E.R.Correct
(2)Ribosomes of only cytosol
(3)Ribosomes of only nucleolus and cytosol
(4)Ribosomes of only mitochondria and cytosol

Answer: (1)

Solution

Ribosomes (the 80S type in the animal cell cytoplasm) are the sites of protein synthesis. The ribosomes attached to the endoplasmic reticulum and to the outer nuclear membrane (which is continuous with the rough ER) are the ones classically described as engaged in protein synthesis in an animal cell, option (1).

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Question ID VK-088715