A) Centrioles - Sites for active RNA synthesis.
B) Lysosomes - Optimally active at a pH of about 8.5
C) Thylakoids - Flattened membranous sacs forming the grana of chloroplasts.
D) Ribosomes - Those on chloroplasts are larger (80S) while those in the cytoplasm are smaller (70S).
Correct Answer: C
Solution :
[c] Centrioles serve as basal bodies for cilia and flagella. They are concerned with spindle formation during cell division. Lysosomes are meniuiane-bound organelles containing many hydrolytic enzymes, which are optimally active at an acidic pH (near pH 5). Thylakoids are membrane-bound organelles found within chloroplasts. The thylakoid membrane, forms many flattened, fluid-filled tubules that enclose a single convoluted compartment. These tubules tend to stack on top of each other to form a structure called a granum.
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