Which of the following biochemical reactions should be classified as endergonic (endothermic)? conversion of glucose into amylopectin conversion of lactose into glucose and galactose conversion of glycogen into glucose conversion of sucrose into glucose and fructose conversion of amylose into glucose
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Which of the following biochemical reactions should be classified as endergonic (endothermic)?
- conversion of glucose into amylopectin
- conversion of lactose into glucose and galactose
- conversion of glycogen into glucose
- conversion of sucrose into glucose and fructose
- conversion of amylose into glucose
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- Which of the following is NOT involved in the activation of glucose for glycogen synthesis? A. Phosphorylation of glucose by hexokinase to glucose-6-phosphate. B. Isomerization of glucose-6-phosphate to fructose-6-phosphate by phosphohexose isomerase. C. Two-step phosphoryl group transfer by phosphoglucomutase. D. Attachment of glucose-1-phosphate to UDP.Which of the following is true for role of glucose-6-phosphate in the regulation of carbohydrate metabolism? -Glucose-6-phosphate allosterically activates glycogen phosphorylase -Glucose-6-phosphate allosterically inhibits glycogen synthase -Glucose-6-phosphate allosterically inhibits hexokinase kinase -None of the above are correct For a reaction A + B --> C + D, [A] is 0.1M, [B] is 0.1M, [C] is 0.1M, and [D] is 0.1M. which of thefollowing is true? -It is a near-equilibrium reaction -The standard free energy change equals 0.00 -The equilibrium constant equals 1.00 -Mass action ratio equals 1.00Which of the following can be used to synthesize glucose by gluconeogenesis in the liver?a. fatty acidb. triglyceridec. glycerold. glycogene. ATP
- Which of the following is a substrate for glycogen synthase? a. UTP-glucose b. Glucose 1-phosphate c. CDP-glucose d. UDP-glucoseiodoacetate is an irreversible inhibitor of glyceraldehyde-3-phosphate dehydrogenase. which of the following is the expected outcome of the exposure of a cell to iodoacetate - Cellular resiration will stop if the cell solely depends on glucose as fuel - The rate of cellular respiration will increase - The reoxidation of coenzymes will noy be affected , but the efficiency of oxidative phosphorylation will be diminished - There will be no effect on cellular respiration as long as the cell has a large glucose reserve -The cell sill not be able to reoxidize the reduced coenzymesThe rate limiting and committed step of the pentose phosphate pathway is catalyzed by which of the following enzymes? A. Glucose-6-phosphate dehydrogenase B. Hexokinase C. 6-Phosphogluconate dehydrogenase D. Transketolase
- Several of the enzymes of glycolysis fall into classes that we will see often in metabolism. What reaction types are catalyzed by each of the following: Kinases Isomerases Aldolases DehydrogenasesArrange the following pathways in order of their occurrence as source of energy for the body during fasting and starvation: 1. glycogenolysis 2. lipid catabolism 3. gluconeogenesis 4. ketogenesisWhen some of the carbons of glutamate are converted to glycogen, what is the order of the following compounds in that pathway?(a) Glucose (b) Glutamate(c) Glycogen (d) Oxaloacetate(e) x-Ketoglutarate (f) Phosphoenolpyruvate
- Which of the following describes the hydrolysis of glycogen to glucose? glycogenesis glycolysis glycogenolysis gluconeogenesisWhich of the following enzymes functions in opposition of PFK, and therefore is inhibited by fructose-2,6-bisphosphate? Fructose 1,6-bisphosphatase Glucokinase Pyruvate Carboxylase Glucose 6-phosphataseGlucose binds to glycogen phosphorylase and competitively inhibits the enzyme. What is the physiological advantage of this?