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Metabolic pathways Transitional Reasoning Practice

Biology · Cellular Energetics · Biology · Energy & Metabolism

1 Biology practice questions on Metabolic pathways. Questions that build towards applied reasoning.

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  1. 1.

    In a linear metabolic pathway, starting substrate P is sequentially converted into intermediate Q by Enzyme 1, intermediate R by Enzyme 2, and finally into end-product S by Enzyme 3. End-product S normally functions as an allosteric feedback inhibitor of Enzyme 1 to regulate metabolic flux. If a targeted chemical agent completely inactivates Enzyme 2 while an abundant supply of substrate P is maintained, what will be the expected metabolic outcome?

    • A) Intermediate Q will continuously accumulate, whereas end-product S will not be synthesized.
    • B) Intermediate R will accumulate, triggering premature feedback inhibition on Enzyme 1.
    • C) End-product S will be produced at an accelerated rate due to the relief of regulatory control.
    • D) Substrate P will remain entirely unconverted because Enzyme 1 requires functional Enzyme 2 to operate.

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