Phosphofructokinase (PFK) is an enzyme that converts fructose 6-phosphate to fructose 1,6-bisphosphate, by adding a phosphate group. This is the first committed step of the metabolic pathway of glycolysis, and thus it is very tightly regulated. AMP binds to PFK at a site distinct from the binding site for fructose 6-phosphate, and stimulates the formation of fructose 1,6-bisphosphate. ATP binds
to PFK at a site distinct from the binding site for fructose 6-phosphate, and inhibits the formation of fructose 1,6-bisphosphate. There are other regulators of this enzyme as well. What is the role of AMP in this example?
A. Competitive inhibitor
B. Noncompetitive inhibitor
C. Allosteric inhibitor
D. Allosteric activator
E. Catalyst
D
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A. G1 to G2 to S to mitosis to cytokinesis B. G1 to S to G2 to mitosis to cytokinesis C. G1 to S to G2 to cytokinesis to mitosis D. G1 to G2 to mitosis to S to cytokinesis E. S to G1 to G2 to mitosis to cytokinesis
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What will be an ideal response?
The cells responsible for clotting are
A. leukocytes. B. erythrocytes. C. platelets. D. chondrocytes. E. osteocytes.
Which of the following is NOT a concept or term related to the flow of energy through living systems?
a. cellular respiration b. consumers c. decomposers d. photosynthesis e. sexual reproduction