You are studying a biochemical pathway that requires ATP as an energy source. To your dismay, the reactionssoon stop, partly because the ATP is rapidly used up and partly because an excess of ADP builds up and inhibitsthe enzymes involved. You are about to give up when the following table from a biochemistry textbook catchesyour eye.A.ذن فهB.SubstratesC.Creatine + ATPATP + H₂OPyrophosphate + H₂OGlucose-6-phosphate + H₂OEnzyme AEnzyme BEnzyme CEnzyme DProductsCreatine-phosphate + ADPWhich of the following reagents is/are most likely to revitalize your reaction?a vast excess of ATPglucose 6-phosphate and enzyme Dcreatine phosphate and enzyme AD. pyrophosphateADP + Phosphate2 PhosphateGlucose + PhosphateAG (kJ/mol)+3-7.3-7.0-3.3

ATP is the energy currency that the cell spends on metabolic transactions. ATP is produced in two…

Answered: You are studying a biochemical pathway…

Biochemistry

6th Edition

ISBN:9781305577206

Author:Reginald H. Garrett, Charles M. Grisham

Publisher:Reginald H. Garrett, Charles M. Grisham

Chapter20: Electron Transport And Oxidative Phosphorylation

Section: Chapter Questions

Problem 19P

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Regarding phosphofructokinase, which of the following statements is true: a. Low [ATP] stimulates the enzyme, but fructose-2,6-bisphosphate inhibits. b. High [ATP] stimulates the enzyme, but fructose-2,6-bisphosphate inhibits. c. The enzyme is more active at low [ATP] than at high, and fructose-2,6-bisphosphate activates the enzyme. d. High [ATP] stimulates the enzyme, and fructose-2,6-bisphosphate activates.
Which of the following statements concerning ATP is true? a. The free energy value for the hydrolysis of ATP is nearly the same for ADP. b. The free energy value for the hydrolysis of ATP is greater than that for ADP. c. ATP hydrolysis is more likely at pH 5 than at pH 7. d. One mole of glycerate-1,3-bisphosphate can phosphorylate one mole of AMP to yield ATP.
Which one of the following buffers the concentration of ATP? Select one: a. Glycolysis b. Acidosis O c. Phosphocreatine O d. Oxidative phosphorylation e. Acetyl coenzyme A
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 added
Chemistry Choose reaction #6 or #10 in glycolysis and write out the complete reaction. Then, answer the following questions about this reaction. Explain your reasoning for each answer. a. Is it coupled? b. Is it catalyzed by a transferase or an oxidoreductase or neither? c. Is Q > or < or ≈ to K?
Phosphorylation is one of the most common mechanisms for regulating the activity of enzymes thatfunction in metabolic pathways. What might the advantage be of exploiting a covalent modificationthat makes use of ATP as a substrate to control the activity of these enzymes?
A 75 kg person doing light work requires about 3000 kcal of food energy perday, 40% of which is actually used by the body’s cells. (The other 60% is lostas heat and in waste products.) Before being used by the cells, effectively allof this energy is stored in ATP, which is then cleaved into ADP and PO3−2 , with the release of 12.5 kcal per mole of ATP.(a) How many moles of ATP are turned over per day in this fashion? Whatmass of ATP does this correspond to? (The molecular weight of ATP is507 g/mol.)(b) The body actually contains approximately 5 g ATP. Estimate the averagerecycle time for an ATP molecule. You see that it is much more efficientto reuse ADP rather than to synthesize it de novo (from scratch).
Which of the following compounds would you expect to liberate the least free energy when hydrolyzed? Explain. a. ATP b. ADP c. AMP d. phosphoenolpyruvate e. phosphocreatine
A chemical reaction that has a negative AC⁰ Select one: O a. will require an input of energy O b. is an endergonic reaction O c. will absorb energy O d. is not a spontaneous reaction O e. is an energy yielding reaction 1 How do enzymes increase the rate of a biochemical reaction? Select one: O a. By lowering the standard free energy O b. By lowering the reduction potential O c. By lowering the activation energy O d. By increasing the activation energy. Oe. By increasing the standard free energy According to the equation AG = AH-TAS, a reaction can be spontaneous under all the following conditions, except: Select one: O a. When both AH and AS are negative. O b. When both AH and AS are positive. O c. When AH is negative and AS is positive. O d. When AH is positive and AS is negative. Oe. Any of these conditions can exist in a spontaneous reaction. If a chemical reaction, such as ATP hydrolysis, releases energy to the surroundings it is called...... Select one: O a. Exergonic O b.…
The enzyme glutamine synthetase catalyzes the following reaction: glutamate + ATP + NH3 → glutamine + ADP + phosphate Which of the following statements about this reaction is correct? a. The reaction is endergonic whether or not enzyme is added b. The reaction is only endergonic if enzyme is added c. The reaction is only exergonic if enzyme is added d. The rate of oxygen production will be unaffected e. The reaction is exergonic whether or not enzyme is added
In order for the reaction rate to rise the activation energy should be Select one: O O O O a. decreased b. increased c. decreased or increased d. not changed Riboflavin gives rise to cofactors:
The correct enzyme involved in synthesizing atp from adp is: a. Kinase b. Protease c. Phosphorylase

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