Two of the bypass reactions of gluconeogenesis involve: phosphorylation of the metabolite using phosphate from Pi. ☐ phosphorylation of the metabolite using phosphate from ATP. dephosphorylation of the metabolite without using it to make ATP. phosphorylation of ADP using phosphate from the metabolite.
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- Two of the bypass reactions of gluconeogenesis involve: a phosphorylation of ADP using phosphate from the metabolite. b phosphorylation of the metabolite using phosphate from ATP. c dephosphorylation of the metabolite without using it to make ATP. d phosphorylation of the metabolite using phosphate from Pi.In this transamination reaction (right), which of the following are the products X and Y? Oxaloacetate Glutamate A Alanine, a-ketoglutarate B Aspartate, a-ketoglutarate C Glutamate, alanine D Pyruvate, aspartateConsider the following reaction sequence. glucose 1-phosphate + UTP UDP-glucose +-0-P-0- UDP-glucose + (glucose), UDP + (glucose),+1 Which of the following characterizes this process? consumes energy O all of these anabolic O a step in gluconeogenesis
- Describe the gluconeogenesis. What are the substrates for gluconeogenesis? (yellow boxes) and write the names of the enzymes belong to the gluconeogenic pathway. Glucose 4 se-6-phosphate usphoglucose isomerase Fructose-6-phosphate Fructose-1,6-bisphosphate HAidolase Triose phosphate Dihydroxyacetone phosphate isomerase Glyceraldehyde 3-phosphate P.. NAD CH,OH Glyceraldehyde 3-phosphate dehydrogenase 1,3-Bisphosphoglycerate CH,OPO,- NADH ADP Phosphoglycerate kinase ATP 3-Phosphoglycerate Phosphoglycerate || mutase 2-Phosphoglycerate 2 X Enolase Phosphoenolpyruvate GDP, CO, GIP Oxaloacetate ADP + P, 1 ATP, HCOS PyruvateAn individual with chronic hypoglycemia was suspected of having a defect in one of the enzymes unique to gluconeogenesis. To identify the defective enzyme, tissue samples from a normal liver were compared to samples from the patient's liver biopsy, using a biochemical assay that measures glucose production from glycerol or malate. It was found that incubation with glycerol produced normal amounts of glucose in both the control and biopsied liver samples; however, incubation with malate did not lead to glucose production in the liver biopsy, even though it did lead to glucose production in the control liver sample. Based on these observations which of the 4 unique gluconeogenesis enzymes is most likely defective in the individual? Consider each enzyme and explain your choice, including why you ruled out enzymes that you did not choose. To answer this question review how glycerol enters gluconeogenesis (figure 9.48) and how citrate cycle metabolites are transported in and out of the…For each of the following situations, predict the major concequences for glycogen metabolism. Explain your logic in a few sentences. Will the amount of glycogen be higher or lower than the normal or unchanged. a) Effect of mutation Y194F in glycogenenin on glycogen synthesis. b) Effect on the loss of the gene that encodes inhibitor I of protein phosphatase I on both glycogen phosphorylase and glycogen synthase. c) Effect on the substrate analog shown below in glycogen synthesis (hint: what is the normal reaction sequence? At which step in the pathway does this sequence become blocked and why?)
- What glycolytic intermediate is fructose converted to in the muscle, such that it can be utilized in glycolysis? Glucose 6-phosphate Fructose 6-phosphate Glyceraldehyde 3-phosphate Dihydroxyacetone phosphateWhat enzyme will not be used if the oxidative portion of the pentose phosphate pathway is operating to produce ribose 5-phosphate? Ribulose 5-phosphate isomerase 6-phosphoglucono-lactonase 6-phosphogluconate dehydrogenase TransaldolaseWhy does the lack of glucose 6-phosphatase activity in the brain and muscle make good physiological sense? Glucose 6-phosphatase allows cells to trap glucose in the cell; however, these tissues primarily rely on noncarbohydrate energy sources. Glucose 6-phosphatase allows cells to generate glucose through gluconeogenesis; however, gluconeogenesis only takes place in the liver. Glucose 6-phosphatase allows cells to release glucose into the blood; however, these tissues should never release glucose. Glucose 6-phosphatase provides glucose 6-phosphate for glycogen synthesis; however, these tissues do not need glycogen.
- Different control mechanisms are used to regulate the synthesis of glycogen. Match the action on the left with the effect on the right. Increase in the concentration of inorganic phosphate ion Decrease in the activity of phosphoprotein phosphatase Phosphorylation of glycogen phosphorylase Dephosphorylation of glycogen synthase Ű Clear All Decreasing glycogen synthesis Increasing glycogen synthesis No effect on glycogen synthesisWhy would glutamate utilize the oxidative deamination pathway over transamination – especially if removal of NH4+ requires ATP? Would it not be favorable for the body to just use transamination?Which of the following events does not occur during Krebs Cycle? Citrate synthase catalyzers the transfer of an acetyl group from acetyl coenzyme A to oxaloacetate to form citrate. Isocitrate dehydrogenase converts citrate to its isomer isocitrate. A carbon dioxide is released when alpha-ketoglutarate is oxidized to succinyl coenzyme A. The energy released from the conversion of succinyl coenzyme A to succinate is used to transfer a phosphate group to ADP to form ATP. During Krebs Cycle, succinate is oxidized to fumarate which is coupled to the reduction of FAD to FADH2. During electron transport, the electrons from FADH2 are transferred to coenzyme Q. Which of the following catalyzes these reactions? NADH dehydrogenase Succinate dehydrogenase FADH2 hydrogenase NADH hydrogenase reductase