1.) An enzyme involved in gluconeogenesis but not in glycolysis is a. hexokinase b. pyruvate kinase c. PEP carboxykinase d. phosphofructokinase-1 2.) Glyceraldehyde 3-phosphate dehydrogenase uses at the active site the aa a. His b. Glu c. Cys d. Ser 3.) A difference between glycolysis and gluconeogenesis is that a. gluconeogenesis takes place in the mitochondria b. gluconeogenesis uses 14 steps to 10 for glycolysis c. gluconeogenesis uses GTP d. gluconeogenesis produces more energy than glycolysis
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Indicate whether each of the following enzymes is utilized in (1) glycolysis but not gluconeogenesis, (2) gluconeogenesis but not glycolysis, or (3) both glycolysis and gluconeogenesis: a. hexokinase b. pyruvate kinase c. enolase d. pyruvate carboxylase
Shaiju T.
Glycolysis Questions 1. Which enzyme helps ensure glucose continuously enters the cell exergonically? a. isomerase b. hexokinase c. pyruvate kinase d. glyceraldehyde 2. Which enzyme catalyzes a c-c (carbon carbon) bond cleavage? a. phosphoglucokinase b. hexokinase c. aldolase d. pyruvate kinase 3. How many carbons are in pyruvate? a. 3 b. 6 c. 2 d. 4 4. Which process produces carbon dioxide? a. lactate fermentation b. glycolysis c. ethanol fermentation 5. Which enzyme determines whether or not PFK-1 commits to glycolysis or not? a. Hexokinase b. Aldolase c. Phosphofructokinase-2 d. PFK-1 activating enzyme 6. Which molecule stimulates the enzymatic production of fructose 1,6 bisphosphate? a. Pyruvate kinase b. PFK-2 c. phosphofructokinase-1 7. The process of gluconeogenesis uses all of the same enzymes as glycolysis, it's just in reverse. a. True b. False 8. Which glycolytic enzyme is NOT bypassed during gluconeogenesis? a. Hexokinase b. Pyruvate Kinase c. Phosphoglycerokinase d. Phosphofructokinase-1
Hem S.
1. Which of these cofactors participates directly in most of the oxidation-reduction reactions in the fermentation of glucose to lactate? A) ADP B) ATP C) FAD/FADH2 D) Glyceraldehyde 3-phosphate E) NAD+/NADH 2. In comparison with the resting state, actively contracting human muscle tissue has a: A) higher concentration of ATP. B) higher rate of lactate formation. C) lower consumption of glucose. D) lower rate of consumption of oxygen E) lower ratio of NADH to NAD+. 3. The steps of glycolysis between glyceraldehyde 3-phosphate and 3-phosphoglycerate involve all of the following except: A) ATP synthesis. B) catalysis by phosphoglycerate kinase. C) oxidation of NADH to NAD+. D) the formation of 1,3-bisphosphoglycerate. E) utilization of Pi. 4. Which one of the following statements about gluconeogenesis is false? A) For starting materials, it can use carbon skeletons derived from certain amino acids. B) It consists entirely of the reactions of glycolysis, operating in the reverse direction. C) It employs the enzyme glucose 6-phosphatase. D) It is one of the ways that mammals maintain normal blood glucose levels between meals. E) It requires metabolic energy (ATP or GTP). 5. All of the following enzymes involved in the flow of carbon from glucose to lactate (glycolysis) are also involved in the reversal of this flow (gluconeogenesis) except: A) 3-phosphoglycerate kinase. B) aldolase. C) enolase. D) phosphofructokinase-1. E) phosphoglucoisomerase.
Madhur L.
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