Which one of the following cellular parts is correctly described? (a) Thylakoids flattened membranous sacs forming the grana of chloroplasts (b) Centrioles sites for active RNA synthesis (c) Ribosomes those on chloroplasts are larger (80S) while those in the cytoplasm are smaller (70S) (d) Lysosomes optimally active at a pH of about 8.5
Option A is correct. Thylakoid are the flattened saclike membranous structures that are stacked on top of one another to form the grana of plant chloroplast. Chlorophyll and other photosynthetic pigments are situated in the thylakoid membranes, which are the site for the lightdependent reactions of photosynthesis.
