All of the following enzymes are involved in glycolysis at some point. Given the sequential reactions in the pathway, which answer(s) list enzymes in the correct order (without skipping any steps) for that part of the pathway represented? a) glyceraldehyde 3-phosphate dehydrogenase; phosphoglycerate kinase; enolase b) hexokinase; phosphoglucoisomerase; aldolase; triose phosphate isomerase c) phosphoglycerate kinase; enolase; pyruvate kinase d) phosphoglycerate mutase; phosphoglycerate kinase; pyruvate kinase e) hexokinase; phosphoglucoisomerase; phosphofructokinase; aldolase Question 6 (1 point) Which of the following is true for BOTH the conversion of acetaldehyde to ethanol and the conversion of pyruvate to lactate? a) The reaction is catalyzed by an enzyme that contains a Rossmann fold structural motif. b) The reaction is catalyzed by a dehydrogenase. c) All of the answers are correct. d) The reaction involves transfer of a hydrogen atom.
Added by Ronald C.
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Glycolysis starts with glucose, and the first enzyme that acts on it is hexokinase, which phosphorylates glucose to glucose-6-phosphate. So, the correct order should start with hexokinase. Show more…
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Examine the series of steps occurring in glycolysis. Which of the following enzymes would be the least subject to regulation? (a) Hexokinase since it makes glucose to get trapped inside the cell, and we need this process all the time (no need to regulate or adapt this process to specific situations). (b) Phosphoglycerate mutase since this is a reversible reaction. (c) Phosphofructokinase represents the "commitment" step in glycolysis. By regulating this step, glycolysis will occur under certain situations only. (d) Pyruvate kinase is never regulated. It is an enzyme that catalyzes a process that produces ATP. We need this reaction operating all the time.
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Which enzymes from the glycolysis pathway are not used by the gluconeogenesis pathway? hexokinase phosphoglucose isomerase phosphofructokinase aldolase triose phosphate isomerase glyceraldehyde-3-phosphate dehydrogenase phosphoglycerate kinase phosphoglycerate mutase enolase pyruvate kinase Which steps in the citric acid cycle generate energy currency in the cell? citrate synthase aconitase isocitrate dehydrogenase alpha-ketoglutarate dehydrogenase succinyl-CoA synthetase succinate dehydrogenase fumarase malate dehydrogenase Which reactions in glycolysis generate energy currency for the cell? hexokinase phosphoglucose isomerase phosphofructokinase aldolase triose phosphate isomerase glyceraldehyde-3-phosphate dehydrogenase phosphoglycerate kinase phosphoglycerate mutase enolase pyruvate kinase
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a) What enzyme(s) is (are) responsible for the following reaction? Pyruvate + CoA + NAD+ → acetyl CoA + NADH + H+ + CO2 Group of answer choices pyruvate dehydrogenase complex pyruvate decarboxylase None of the answers is correct pyruvate carboxylase acetyl CoA synthetase b) Which statement regarding the citric acid cycle is false? Group of answer choices Its role is strictly limited to energy conservation during glucose oxidation. It is found in the mitochondria in eukaryotes. In sequential reactions, the citric acid cycle converts citrate to oxaloacetate and releases two CO2. The carbon atoms that feed into the cycle as acetyl-CoA do not leave as CO2 during their first turn of the cycle. Part of the chemical logic behind it involves the conversion of the relatively unreactive methyl (-CH3) group of acetyl-CoA to a more reactive methylene (-CH2-) group.
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