How come the following reaction releases this much energy? PEP+ADP+H*z Pyruvate + ATP Could it be because it's irreversible? Because the PEP is stuck in the enol form? Because PEP happens to have a higher phosphoryl group transfer potential than ATP? All or of the above?
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- What is the ∆G naught' for a phosphoryl transfer from ATP to glycerol? The hydrolysis of α-glycerophosphate to glycerol and inorganic phosphate has a ∆G naught' of -8.37 kj/mol. ATP + H2O <--> ADP + Pi ∆G naught' = -30.5 kj/mol What is the efficiency of this reaction (i.e. what % of the available energy remains in the system after the reaction)? Express your answer as a % of the total amount of energy available in the system. Where does the rest of the energy go?Which of the following best indicates a reason why Hisneeds to be a good proton donor (not acceptor) in the catalytic triad mechanism? So that it can create the alkoxide ion. So that it can create a hydroxyde ion. None of the other options is suitable because His's only role is to be a proton acceptor. So that the first product forms and leaves with the correct number of H's. So that it can stabilize the transition state.In electron transfer, only the quinone portion of the ubiquinone undergoes oxidation-reduction; the isoprenoid side chain remains unchanged. What is the function of this chain?
- Which of the following statements correctly describe(s) the reaction: ADP + Pi + H+ → ATP + H2O ΔG°'= +7.29 kcalmolkcalmol A. ATP is less stable than ADP. B. Hydrolysis of ATP is spontaneous. C. Phosphorylation of ADP is nonspontaneous. D. Conversion of ATP to ADP will release heat.Which of the following statements are true?For each, explain why or why not.(a) All coenzymes are electron-transfer agents.(b) Coenzymes do not contain phosphorus or sulfur.(c) Generating ATP is a way of storing energy.Which of the following metabolic processes can occur withouta net influx of energy from some other process?(A) ADP +~P i S ATP + H2O(B) C6H12O6 + 6 O2 S 6 CO2 + 6 H2O(C) 6 CO2 + 6 H2O S C6H12O6 + 6 O2(D) Amino acids S Protein
- The enzyme glutamine synthetase catalyzes the following reaction: glutamate + ATP + NH3 → glutamine + ADP + phosphate Which of the following statements about this reaction is correct? he reaction is only exergonic if enzyme is added b. The reaction is endergonic whether or not enzyme is added c. The reaction is exergonic whether or not enzyme is added d. The rate of oxygen production will be unaffected e. The reaction is only endergonic if enzyme is addedThe aspartate–malate shuttle transfers electrons from cytoplasmic NADH to the electron transport system. Which of the following molecules is not directly involved in this pathway? a. malate b. oxaloacetate c. citrate d. α-ketoglutarateIn the first step of glycolysis, glucose can be phosphorylated to glucose-6-phosphate, because.. A. transfer of a phosphate from ATP to glucose is endergonic. B. a phosphoanhydride bond has higher energy of hydrolysis than is required for formation of a phosphoester bond. C. the reaction does not require an enzyme. D. the reaction is highly reversible. E. All of the above are correct.
- The reduced coenzymes NADH and FADH2 are oxidized in the ETS. What is the final electron acceptor of the ETS? What is the function of the H+ ion in ATP synthesis?Which of the following statements is TRUE in describing the activity of the lactaseenzyme? A. Lactase is converted to glucoseB. One lactase enzyme can catalyze many reactions C. The shape of lactase does not change during the reaction D. Lactase can function effectively at many different pH levelsIf 32P-labeled ATP is provides for the reactions of glycosis, which of the following would be TRUE about 1.3 biphosphoglycerate? A. 50% of 1,3-bis phosphoglycerate would contain 32P B. 100% of 1,3-bis phosphoglycerate would contain 32P on carbon 1 C. 100% of 1,3-bis phosphoglycerate would contain 32 P on carbon 3 D. 50% of 1,3-bis phosphoglycerate would contain 32P on carbon 3 E. 50% of 1,3-bis phosphoglycerate would contain 32P on carbon 1