Which one of the following cellular parts is correctly described?

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Lysosomes optimally active at a pH of about 8.5.

Centrioles are sites for active RNA synthesis.

Ribosomes on chloroplasts are larger (80S) while those in the cytoplasm are smaller (70S).

Thylakoids are flattened membranous sacs forming the grana of chloroplasts.

answer is C.

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Detailed Solution

A number of organised flattened membranous sacs called the thylakoids, are present in the stroma. Thylakoids are arranged in stacks like the piles of coins called grana. Nucleolus is a site for active ribosomal RNA synthesis. The isolated lysosomal vesicles have been found to be very rich in almost all types of hydrolytic enzymes (hydrolases – lipases, proteases, carbohydrases) optimally active at the acidic pH. 70S ribosomes are present in the chloroplast and in the cytoplasm of eukaryotes 80S ribosomes are present.

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