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Chloroplast structure Transitional Reasoning Practice

Biology · Cellular Energetics · Biology · Photosynthesis

1 Biology practice questions on Chloroplast structure. Questions that build towards applied reasoning.

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  1. 1.

    A biology research team separates intact chloroplasts into two components: Fraction X consists of the internal fluid surrounding the membrane networks, while Fraction Y contains the isolated, stacked flattened sacs. When light and appropriate biochemical substrates are supplied in vitro, oxygen gas is generated exclusively in Fraction Y, whereas carbon dioxide fixation occurs in Fraction X only when supplied with ATP and NADPH. Based on this structural compartmentalization, which of the following statements correctly identifies these chloroplast regions and their functional properties?

    • A) Fraction X represents the thylakoid lumen where photolysis occurs, while Fraction Y represents the intermembrane space where ATP is consumed.
    • B) Fraction X represents the grana containing photosynthetic pigments, while Fraction Y represents the stroma harboring the enzymes of the Calvin cycle.
    • C) Fraction X represents the outer membrane controlling metabolite transport, while Fraction Y represents the stroma synthesizing carbohydrates.
    • D) Fraction X represents the stroma where the Calvin cycle synthesizes sugars, while Fraction Y represents the thylakoid membranes where light-driven water splitting generates oxygen.

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