Question

The rate limiting reaction of aerobic respiration involves the phosphorylation of [phosphofructokinase, fructose biphosphate, fructose phosphate, ADP, hexose] by the enzyme [cytochrome c oxidase, hexokinase, phosphofructokinase, succinate dehydrogenase]. The rate at which this enzyme makes product is [increased, decreased] when ATP levels rise because the molecule [fumarate, succinate, AMP, ATP, cAMP, PKA] binds to an [allosteric, reglatory region, active, coding region] site on the enzyme and acts as a(n) [indirect, transcriptional, direct, transitional] [factory, factor, inhibitor, activator]. When ATP levels fall [fumarate, succinate, AMP, ATP, cAMP] binds to [the coding region, active site, reglatory region, allosteric site] of [katrinase, hexokinase, cytochrome c oxidase, phosphofructokinase]. This interaction leads to an increase of cellular [LSD, cAMP, AMP, ADP, ATP] , so that this is a n example of a [negative, positive] feedback loop.

Answer 1

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The rate limiting reaction of aerobic respiration involves the phosphorylation of phosphofructokinase by the enzyme phosphofructokinase . The rate at which this enzyme makes product is decreased when ATP levels rise because the molecule ATP binds to an allosteric site on the enzyme and acts as a(n) direct inhibitor  . When ATP levels fall AMP binds to allosteric site of phosphofructokinase . This interaction leads to an increase of cellular ATP so that this is a n example of a negative feedback loop.