Biochemistry
9th Edition
ISBN: 9781319114671
Author: Lubert Stryer, Jeremy M. Berg, John L. Tymoczko, Gregory J. Gatto Jr.
Publisher: W. H. Freeman
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What is the first step in the payoff phase of glycolysis?
answer choices
A.)Oxidation of glyceraldehyde 3-phosphate to 1, 3-bisphosphoglycerate
B.) Reduction of 1, 3-bisphosphoglycerate to glyceraldehyde 3-phosphate
C.) Reversible conversion of dihydroxyacetone phosphate to glyceraldehyde 3-phosphate
D.)Irreversible conversion of dihydroxyacetone phosphate to glyceraldehyde 3-phosphate
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- Is GAPDH only a glycolytic enzyme? What are the other physiological functions of GAPDH?arrow_forwardSelect which of the following enzymes unique to glycolysis are also sites of regulation for glycolysis. Select all that apply. a) glyceraldehyde 3 P dehydrogenase b) PFK c) pyruvate kinase d) hexokinase e) enolase f) phosphoglycerate mutasearrow_forwardGluconeogenesis occurs in liver and kidney. Which is of the following enzyme are important for gluconeogenesis are expressed exclusively in these tissues? Select one: a. Glucose-6-phosphatase b. Fructose-1,6-Bisphosphatase c. Phosphoenolpyruvate carboxykinase d. Pyruvate carboxylasearrow_forward
- Glyceraldehyde 3-phosphate dehydrogenase is used to do which of the following steps of glycolysis Select one: a. 1,3 Bisphosphoglycerate is converted to 3-phosphoglycerate b. Phosphoenolpyruvate is converted to pyruvate c. 2-phosphoglycerate is converted to Phosphoenolpyruvate d. Glyceraldehyde-3-phosphate is converted to 1,3 Bisphosphoglycerate e. Fructose-6-phosphate is converted to Fructose-1,6,bisphosphate f. Dihydroxyacetone (Glycerone Phosphate) is converted to Glyceraldehyde-3-phosphate g. Fructose-1,6 Bisphosphate is converted to Dihydroxyacetone and Glyceraldehyde-3-phosphate h. Glucose-6-phosphate is converted to Fructose-6-phosphate i. 3-phosphoglycerate is converted 2-phosphoglycerate j. Glucose is converted to Glucose-6-phosphatearrow_forwardWrite the sequence of steps for the biosynthesis of phosphatidylcholine by the salvage pathway from oleate, palmitate, dihydroxyacetone phosphate, and choline. Name the enzyme for each step.arrow_forwardGlycogen is the major animal storage polysaccharide, and is a polymer of glucose. a) List ALL the biochemical steps involved in storing GLUCOSE as glycogen b) Give NAME/S of the ENZYMES involved in EACH listed step c) What PULLS the reaction forward? d) Give the NAME of the tissue where these steps occur. (HINT: remember glycogen is branched chain).arrow_forward
- The last step of glycolysis converts phosphoenolpyruvate to pyruvate. Several intermediates involved in the steps for the conversion of pyruvate to phosphoenolpyruvate via gluconeogenesis are given. Choose and place the right intermediates produced from these steps in the correct order. (Select from: Oxaloacetate, Ethanol, Pyruvate, Ketoglutarate, Phosphoenolpyruvate, Malate, Fumarate) _________ → _________ → _________ → __________ → Phosphoenolpyruvatearrow_forwardConsider an alternative glycolysis pathway that starts with the phosphorylation of glucose to give glucose-6-phosphate. This (hypothetical) pathway exists in a (hypothetical) organism that does not express glucose-6-phosphate isomerase. Instead, the next step of this hypothetical pathway is a Glucose-6-Phosphate Aldolase. Draw the product or products that would be obtain by the reaction of Glucose – 6 – Phosphate with Glucose – 6 Phosphate Aldolase. Assume the reaction is completely irreversible. Explain in 1-3 sentences how you obtained your answerarrow_forwardChoose which enzyme is likely deficient based on the symptoms described below: Elevated blood lactate, alanine and pyruvate a) lactate dehydrogenase d) citrate synthase c) pyruvate dehydrogenase d) pyruvate kinasearrow_forward
- alpha-ketoglutarate dehydrogenase will do which of the following: Select one: a. Pyruvate is decarboxylated to become acetyl-CoA producing NADH and Carbon dioxide b. Succinate is oxidized to become fumarate forming FADH2 c. Succinyl-CoA becomes Succinate and forms one ATP molecule and Coenzyme A-SH d. Oxaloacetate combines with the acetyl from acetyl-CoA to produce Citric acid(citrate) e. Malate is oxidized to become oxaloacetate forming NADH f. Isocitrate and then decarboxylated and oxidized to produce alpha-ketoglutarate, Carbon dioxide and NADH g. Citrate is rearranged to become Isocitrate h. Fumarate is combined with water to become Malate i. alpha-ketoglutarate is oxidized and decarboxylated to produce Succinyl-CoA, Carbon dioxide and NADHarrow_forwardWhich of the following stimulates the conversion of pyruvate to acetyl-CoA? a) Activation of pyruvate dehydrogenase kinase b) A decrease in the ratio of NAD+/NADH c) Bothaandb d) Neither a nor barrow_forwardConsider the following reaction of the glycolysis pathway. Which statement is NOT true regarding this reaction? P + C-H NADH + H+ NAD+ C-0-P H-C-OH H-C-OH Glyceraldehyde- CH₂0-P 3-phosphate dehydrogenase CH₂0-P 1,3-Bisphosphoglycerate Glyceraldehyde-3- phosphate O A one-carbon compound (1C) is converted into a two-carbon compound (2C). O It requires a coenzyme. O It is a redox reaction catalyzed by the enzyme glyceraldehyde-3-phosphate dehydrogenase. O It is a phosphorylation reaction.arrow_forward
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