The part of chloroplast where CO2 is fixed to manufacture sugar is__________?
Correct answer: A. Stroma
- A. Stroma
- B. Grana
- C. Thylakoid
- D. Outer membrane
Explanation
Carbon dioxide is fixed into carbohydrate during the Calvin cycle, which takes place in the chloroplast stroma. The stroma contains the enzymes needed for carbon fixation, whereas grana and thylakoids carry out the light-dependent reactions that provide ATP and NADPH. The likely mistake is choosing grana because they contain chlorophyll, but they do not directly fix CO2 into sugar.
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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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