Pyruvate is used to generate glucose through a reversal of the glycolytic reactions under specific conditions. Name two physiological conditions when gluconeogenesis occurs and name which molecules are used under these conditions to yield pyruvate in the liver.
Two physiological condition when gluconeogenesis occur-
1) During starvation for long time especially glucose starvation; Liver glycogen is the major substrate or molecules used under above mentioned condition to yields pyruvate in Liver.
2) During excessive workout for long time; Lactate from muscles that are produced due to anoxic condition at muscles act as molecules that's used to yields pyruvate in Liver.
There are also other conditions and molecules like amino acids (alanine, glutamine); triglycerides can be used for pyruvate production.
Pyruvate is used to generate glucose through a reversal of the glycolytic reactions under specific conditions....
under anaerobic conditions, i.e. during vigorous exercise, when hemoglobin is not able to supply adequate amounts of oxygen to your tissues, your muscles accumulate lactate derived pyruvate. This reaction is very favorable, thus the reversal would not be favorable. However, in the liver the reaction can easily be reversed and lactate can serve as a substrate for gluconeogenesis. Explain how this is accomplish
Which precursors can be used to make glucose in gluconeogenesis? amino acids, pyruvate, lactic acid, and fatty acids b. amino acids, pyruvate, and fatty acids amino acids, pyruvate, lactic acid, and glycerol d. pyruvate, lactic acid, glycerol, and fatty acids & a. C. is the biosynthetic pathway that assembles glucose into branch chains of 9. glycogen Glycolysis b. Gluconeogenesis Glycogenolysis d. Glycogenesis a. c. 10. Which hormone favors anabolic metabolic pathways? a. insulin b. glucagon c. cortisol d. epinephrine 11....
A suspension of yeast cells is being grown under anaerobic conditions such that glucose is degraded to ethanol and carbon dioxide. Adding an inhibitor of alcohol dehydrogenase to the yeast cell suspension results in rapid cell death. Why? a.) Without alcohol dehydrogenase, the acetaldehyde concentration increases to levels that are toxic to the yeast cells. b.) NADH generated during glycolysis cannot be recycled back to NAD+, thus anaerobic ATP production through glycolysis cannot be maintained. c.) Pyruvate is no longer...
QUESTION 14 What is the ratio of carbon-bound hydrogens to carbon of glucose? O 6/6 O 7/6 O 12/6 6/7 QUESTION 22 Which of the following is false about gluconeogenesis? Glycolysis is catabolic, while gluconeogenesis is anabolic There are four reactions unique to gluconeogenesis Gluconeogenesis is simply the reverse of glycolysis Gluconeogenesis synthesizes glucose All of these are true QUESTION 36 Use the information below to answer questions 36-38 The concentration of glucose in human blood plasma is maintained at...
Do expect the cell to produce more ATP from one glucose molecule or from one fatty acid molecule? Explain your answer. Indicate whether the following statements are true or false. If a statement is false, explain why it is false The proteins of the electron-transport chain remove a pair of high-energy electrons from the cofactors, NADH and FADH_2, after which the electrons move across the inner mitochondrial membrane to maintain the voltage gradient. Gluconeogenesis is a linear reaction pathway that...
1. During the aerobic metabolism of glucose, glucose is a. Reduced to form water b. Oxidized to form water c. Reduced to form CO2 d. Oxidized to form CO2 2. Which of the following describes the equation: FAD + XH à FADH2 + X. a. FAD is reduced to FADH2 b. It is a coupled reduction - oxidation reaction c. XH, is oxidized to X d. All of the above 3. Which of the following is FALSE about glycolysis? a....
3 20 The conversion pyruvate to either ethanol or lactate occurs A. when there is an abundance of pyruvate but a deficiency of onygen B. when there is an abundance of BOTH pyruvate and oxygen C. when there is a deficiency of BOTH pyruvate and oxygen D. for the regeneration of NADH so that hydrolysis of ATP can continue to fuel the glycolysis pathway Explain how gluconeogenesis differs from gtycolysis 21 Gluconeogenesis is simply the reverse of all 10 steps...
QUESTION 15 Which of the following is EXERGONIC? 6 CO2 + 6H20 - glucose + O2 fructose 6-phosphate + ATP – fructose 1,6-bisphosphate + ADP (AG = -3.4 kcal/mol) glucose 6-phosphate + ATP – fructose 6-phosphate + ADP (AG = +0.5 kcal/mol) GDP - Pi GTP + H2O QUESTION 17 Fate(s) of pyruvate is(are) Check all that apply. formation of ethyl alcohol by yeasts formation of glucose by gluconeogenesis in liver cells production of ketone bodies formation of lactate under...
In a "pulse chase" experiment under anaerobic conditions, 14C glucose is added to an ethanol-producing yeast cell extract just long enough that each intermediate in the ethanol fermentation is labeled with a 14C (pulse). The 14C label is then diluted so that no additional radioactivity is incorporated into the intermediates (chase). 1. What position in ethanol will be labeled with 14C if 14C-glucose labeled at position C-1 is used? 2. Where should the 14C label sit in glucose for it...
match the following 1. Fructose 1,6-bisphosphate is converted to Fructose 6- phosphate through this enzyme _____ 2. Synthesis of glucose from noncarbohydrate precursors _____ 3. Stage in which two molecules of ATP are consumed _____ 4. This is formed from pyruvate in yeast and several other microorganisms through fermentation _____ 5. The isomerization of glucose 6-phosphate to fructose 6-phosphate is a coversion of an aldose into a …._____ 6. Pyruvate is converted by pyruvate carboxylase into this intermediate _____ 7....