Phosphofructokinase is an important control enzyme in the regulation of cellular respiration. Which of the following statements concerning phosphofructokinase is not true?
A) It is activated by AMP (derived from ADP).
B) It is inhibited by ATP.
C) It is activated by citrate, an intermediate of the citric acid cycle.
D) It specifically catalyzes the conversion of fructose-6-phosphate to fructose-1,6-bisphosphate, an early step of glycolysis.
E) It is an allosteric enzyme.
Ans: A) It is activated by AMP (derived from ADP).
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The most serious consequence to humans of a decrease in global biodiversity would be the _____
A) increase in global warming and thinning of the ozone layer B) potential loss of ecosystem services on which people depend C) increase in the abundance and diversity of edge-adapted species D) loss of source of genetic diversity to preserve endangered species E) loss of species for use as crops.
Using what you know about how carbohydrate monomers are linked to form polymers, explain why most animals can
digest starch more easily than cellulose?
What will be an ideal response?Which is a correct description of hormone action?
A. Testosterone stimulates corpus luteum. B. LH stimulates Sertoli cells in the testes. C. GnRH stimulates the anterior pituitary gland. D. Testosterone regulates LH and FSH in a positive feedback loop. E. FSH stimulates Leydig cells in the testes.
The progression of species that would take place in an abandoned field is called ________
Fill in the blank(s) with correct word