The grana of a chloroplast consist of
Correct answer: A. stacks of flattened thylakoid sacs
- 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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About Animal and Plant Cell
Animal and plant cells share a plasma membrane, cytoplasm, nucleus, ribosomes, mitochondria and endoplasmic reticulum, but plant cells also have a cellulose cell wall, chloroplasts and a large permanent vacuole. Questions cover organelle structure and function, differences between the two cell types, and how membranes control movement of substances.
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