Question

Which of the following features is/are correct regarding ribosomes?
I. Non-membrane bound
II. Absent in plastids and mitochondria
III. Present in the cytoplasm and RER
IV. Take part in protein synthesis

• A. Only II
• B. I and II
• C. I, II, III and IV
• D. I, III and IV

Answer 1

The correct option is D I, III and IV

Ribosomes are naked ribonucleoprotein protoplasmic particles in which a covering membrane is absent. They are responsible for protein synthesis in the cell. The ribosomes are either present scattered in the cytoplasm or attached to the surface of the rough endoplasmic reticulum (RER). 70S ribosomes are found in plastids and mitochondria.
Thus, statements I, III and IV are correct.