Which one of the following cellular parts is correctly described?
- AThylakoids - flattened membranous sacs forming the grana of chloroplasts
- BCentrioles - sites for active $RNA$ synthesis
- CRibosomes - those on chloroplasts are larger $(80S)$ while those in the cytoplasm are smaller $(70S)$
- DLysosomes - optimally active at a $pH$ of about $8.5$
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