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Which one of the following cellular parts is correctly described?

1. Centrioles - Sites for active RNA synthesis.
2. Lysosomes - Optimally active at a pH of about 8.5.
3. Thylakoids - Flattened membranous sacs forming the grana of chloroplasts.
4. Ribosomes - Those on chloroplasts are larger (80S) while those in the cytoplasm are smaller (70S).

Correct answer: Thylakoids - Flattened membranous sacs forming the grana of chloroplasts.

Solution

Thylakoids are flattened membrane sacs inside chloroplasts, and stacks of them form grana. The other choices contain incorrect functions or sizes: centrioles are not RNA-synthesis sites, lysosomes work best in acidic conditions, and the ribosome sizes are reversed.

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