Which one of the following cellular parts is correctly described
A. Ribosomes - those on chloroplasts are larger (80s) while those in the cytoplasm are smaller (70s)
B. Lysosomes - optimally active at a pH of about 8.5
C. Thylokoids - flattened membranous sacs forming the grana of chloroplasts
D. Centrioles sites for active RNA synthesis
