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أسئلة في البيوكمستري .. تحتاج إلى إجابة ؟؟

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  • أسئلة في البيوكمستري .. تحتاج إلى إجابة ؟؟

    أحببت اليوم أن تشاركوني في حل مجموعة من أسئلة البيوكمستري .. عرضها علينا أستاذنا .. فأحببت أن أعرضها عليكم أيضا لكي تساعدوني في حلها .. وحتى نؤكد المعلومة لدينا .. أتمنى من الجميع المشاركة في الحل ...


    multiple choice :



    1. Fructose-l,6-bisphosphate may accumulate when glucose is anaerobically
    metabolized by muscle extracts because:

    A. the glyceraldehyde-3-phosphate dehydrogenase reaction cannot proceed
    without a continuing source of phosphate

    B. ATP inhibits phosphofructokinase

    C. the glyceraldehyde-3-phosphate dehydrogenase reaction cannot proceed
    without a continuing source ofNAD+

    D. the glyceraldehyde-3-phosphate dehydrogenase reaction cannot proceed
    without a continuing source of ATP.

    E. NADH inhibits phosphofructokinase





    2. Aerobic oxidation of carbohydrates is accelerated by catalytic amounts of fumarate,
    malate,or citrate. Aerobic oxidation is blocked by malonate because:

    A. it inhibits condensing enzyme

    B. It blocks electron transport

    C. it inhibits glycolysis
    D. it inhibits succinate dehydrogenase

    E. fatty acid synthesis from malonyl-CoA is blocked

    3. Citrate, which is oxygenated in the ~position, is converted to a-ketoglutarate, which
    is oxygenated in the a position. The enzymes that effect this change are:

    A. isocitrate dehydrogenase and a-ketoglutarate dehydrogenase.

    B. succinate dehydrogenase and aconitase

    C. aconitase and isocitrate dehydrogenase

    D. aconitase and malic dehydrogenase

    E. condensing enzyme and malic enzyme

    4. Pyruvate generated by glycolysis must entcr the mitochondria to be oxidized:

    A. because the mitochondria are impermeable

    B. so that the cytosol remains electrically neutral

    C. because pyruvate dehydrogenase is a mitochondrial enzyme

    D. be exchange with malate

    E. to generate malate in the malic enzyme reaction


    5. The inller mitochondrial membrane is generally impermeable to:

    A. pyruvate

    B. nitrophenol

    C. malate


    D. coenzyme A esters

    E. a~glycerophosphate



    6. Valinomycin uncouples oxidative phosphorylation by:


    A. making mitochondria permeable to K+


    B. forming a complex with factor F-2

    C. inhibiting the ouabain-sensitive ATPase


    D. reacting with the oxidized form of ubiquinone


    E. hydrolyzing ATP



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