Phosphofructokinase is an important control enzyme in the regulation of cellular respiration. which of the following statements correctly describes phosphofructokinase activity?
a) it is inhibited by amp.
b) it is activated by atp.
c) it is activated by citrate, an intermediate of the citric acid cycle.
d) it catalyzes the conversion of fructose 1,6-bisphosphate to fructose 6-phosphate, an early step of glycolysis.
e) it is an allosteric enzyme.