The protein-rich fluid matrix enclosed within chloroplasts is known as____________?
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Answer: B. Stroma
Explanation
The stroma is the protein-rich gel-like fluid matrix enclosed inside the chloroplast membrane. This internal fluid contains enzymes required for the light-independent reactions of photosynthesis. Carbohydrate synthesis occurs within this stroma matrix during the carbon-fixing Calvin cycle. Chloroplasts are bounded by a double membrane enclosing internal thylakoids and fluid stroma. The stroma houses chloroplast DNA, ribosomes, and metabolic enzymes necessary for protein synthesis. Carbon dioxide fixation converts inorganic carbon into sugars inside this specialized compartment.
Agricultural researchers study stroma enzymes like rubisco to improve plant carbon fixation rates. Biochemical pathways operating in the stroma support global primary production and atmospheric oxygen. Genetic engineering projects aim to optimize stroma enzyme efficiency for increased crop production. Grana are stacked thylakoid membrane structures suspended within the fluid stroma matrix. Thylakoids are membrane-bound compartments where light-dependent photosynthetic reactions take place. None of these is incorrect because stroma is the correct term for the fluid matrix.
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