Question

1. How does a cell know when it needs ATP? 2. What enzymes are controlled in...

1. How does a cell know when it needs ATP?
2. What enzymes are controlled in glycolysis?
3. What are the allosteric effectors of phosphofructokinatr and pyruvate kinase?
4. How is NAD+ reduced to NADH?
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Answer #1

1)-Cells don't know that it needs more ATP. It is regulated by feedback system governed by cytosol level of e.g.AMP,ADP,ATP and Indirectly by several hormones.

2)-In glycolysis enzyme hexokinase, phosphofructokinase and pyruvate kinase are serve as control site.

3)-Allosteric effector of phosphofructokinase is based on cell's energy need. ATP act as allosteric inhibitor. Allosteric effector of pyruvate kinase is fructose 1,6-bisphosphate.

4)-NAD+ is oxidising agent and accept electron from other and reduced to NADH.

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