Phosphofructokinase is regulated by a number of factors, including high levels of ATP. Why is this enzyme regulated by ATP levels?
A. If ATP levels are high, this provides a mechanism to directly inhibit the electron transport chain, thus preventing the formation of a proton gradient in the intermembrane space of mitochondria.
B. If ATP levels are high, this provides a mechanism to directly inhibit the Krebs cycle, thus preventing further generation of NADH, FADH2, and ATP molecules that are not needed.
C. If ATP levels are high, it is important to directly inhibit the reaction that commits the substrate to glycolysis to allow the substrate to be available for other reactions, since the cell has ample energy.
D. If ATP levels are high, it is important to inhibit ATP synthase, and phosphofructokinase directly inhibits ATP synthase.
Answer: C
You might also like to view...
The soil type that has the best oxygen concentration and water penetration is called ________
a. topsoil b. leaching c. loam d. rock e. humus
Tightly curled or wooly hair is caused by a dominant gene in humans. If a heterozygous curly-haired person marries a person with straight hair, what percentage of their offspring would be expected to have straight hair?
A) 100% straight B) 50% straight C) 75% straight D) 25% straight E) It is impossible to predict the outcome.
Carbonated cola is more acidic than coffee or even orange juice because cola contains phosphoric acid. What is the molar concentration of [H3O+] in a cola that has a pH of 3.120?
a) 7.58 × 10?4 b) 7.59 × 10?4 c) 7.6 × 10?4 d) 3.120 × 10?3 e) 0.494 f) 1.318 × 103
Which of the following chemical agents is used for sterilization?
A) alcohol B) phenolics C) ethylene oxide D) chlorine E) soap