The grana of a chloroplast consist of
- A. stacks of flattened thylakoid sacs
- B. free ribosomes and DNA
- C. grains of stored starch
- D. infoldings of the outer membrane
Explanation
Thylakoids pile into grana, and their membranes carry chlorophyll and the photosynthetic electron chain, while the surrounding stroma carries the enzymes of carbon fixation. Starch grains may be stored nearby but are not what grana are.
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