A) Thylakoids-Flattened membranous sacs forming the grana of chloroplasts
B) Centrioles-Sites for active RNA synthesis
C) Ribosomes-Those on chloroplasts are larger (80 S) while those in the cytoplasm are smaller (70 S)
D) Lysosomes-Optimally active at a pH of about 8.5
Correct Answer: A
Solution :
Centrioles are a membranous hollow micro cylinders occur in pair and play important role in cell division. Ribosomes in chloroplast are 70 S type while those of cytoplasm in eukaryotic cells are 80 S type. The enzymes of lysosome (called suicidal bag) function at acidic pH (i.e.5).
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