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Biochemistry

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Carbohydrates

Question
11 out of 78
 

Which one of the following statements concerning glycolysis is correct?



A The conversion of glucose to lactate requires the presence of oxygen.

B Hexokinase is important in hepatic glucose metabolism only in the absorptive period following consumption of a carbohydrate-containing meal.

C Fructose 2,6-bisphosphate is a potent inhibitor of phosphofructokinase.

D The regulated reactions are also the irreversible reactions.

Ans. D The regulated reactions are also the irreversible reactions.

a. Hexokinase, phosphofructokinase, and pyruvate kinase are all irreversible and are the regulated steps in glycolysis.

b. The conversion of glucose to lactate (anaerobic glycolysis) is a process that does not involve a net oxidation or reduction and, thus, oxygen is not required.

c. Glucokinase (not hexokinase) is important in hepatic glucose metabolism only in the absorptive period following consumption of a carbohydrate-containing meal.

d. Fructose 2,6-bisphosphate is a potent activator (not inhibitor) of phosphofructokinase. The conversion of glucose to lactate yields two ATP but no net production of NADH.

Carbohydrates Flashcard List

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