Which of the following is incorrect? a. Regulatory steps are irreversible O b. Regulation of a pathway occurs at steps with the highest (-) free energy changes O c. None; all the other choices are correct O d. Not all the steps of a pathway are regulatory steps
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- 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.…Which of the following statements about allosteric enzyme regulations are true. A. Allosteric regulations is always used to negatively regulate enzyme activity. B. Allosteric regulations are often end products of a biochemical pathway. C. Diffrent allosteric regulators turn enzyme activity on or off by binding the same site. D. Binding of allosteric regulators alters the conformation of an enzyme. B only B and C B and D D only A and DThe productionof ATP (cellular respiration) is actually a(n). However, the reaction requires the rxn. 14. of Glucose. A. catabolic : anabolism B. anabolic : catabolism C. exergonic : endergonic conversion D. hydrolytic : dehydration. the
- initial reactant intermediates final product pathway 1 A B D E enzyme 1 enzyme 2 enzyme 3 enzyme 4 pathway 2 F G enzyme 5 enzyme 6 3. Using the figure above, discuss for the following cases the consequences for the cell for each how the regulatory scheme. Would the levels of final products E and G increase or decrease if..? а. The final product E inhibits Enzyme 3. b. The product F was positive regulator for Enzyme 2.Which enzyme catalyzes the following reaction? H OH CH₂OPO3²- OH H OH A. an aldolase B. an isomerase C. D. a protease E. a synthetase OH a dehydrogenase CH₂OPO3²- H H OH H CH₂OH OHWhich of the following is incorrect? a. The ratio "catalyzed rate/uncatalyzed rate" is known as catalytic power b. Most enzymes exhibit a higher degree of specificity than non-biologic catalysts O c. Most enzymes are proteins; but a few are RNA molecules Od. Most enzymes exhibit a higher catalytic power than non-biologic catalysts
- All of the biochemical pathways in a cell constitute O a. coupling reactions O b. metabolism c. exergonic reactions only o d. free energy O e. endergonic reactions onlyWhich statement is FALSE? a. For S P, a catalyst shifts the reaction equilibrium to the right. b. After a reaction, the enzyme involved becomes available to catalyze the reaction again. c. A reaction may not occur at a detectable rate even though it has a favorable equilibrium. d. Substrate binds to an enzyme's active site. e. Lowering the temperature of a reaction will lower the reaction rate.Zymogens are NOT enzymatically active, because O A. they are not yet shaped such that essential proximity and orientation catalysis can occur. B. the active site amino acids have been mutated. O C. they have not yet bound the proper cofactor D. they are always smaller than active enzymes.
- An enzyme is near maximum efficiency when A. its turnover number is near Vmax- B. kcat/KM is near 108 M-1s-1 ock1 << k.1. D. kcat/KM is equal to kcat- OE. KM is large when k2 exceeds k1.An enzyme catalyzes a reaction in which substrateA is cleaved into two products, P and Q. In the catalytic mechanism, the enzyme converts A to a covalently-bound reaction intermediate X and product P, P then desorbs from the enzyme, and in a second chemical step, the enzyme converts the intermediate X in the EX complex to the final product Q (in EQ), which then desorbs from the enzyme E.You discover two inhibitors of this enzyme, I and J. I is a competitive inhibitor of the substrate A, and has nearly double the molecular weight of J. On the other hand, J is a mixed inhibitor of enzyme E, and its inhibitory effect on Km/ Vmax (the slope effect from the double reciprocal plot) is greater than that of 1 / Vmax (the intercept effect in a double reciprocal plot). That is Kis< Kii . At low pH, the conversion of EX to EQ is greatly slowed, kcat is decreased, and the intercept effect of inhibitor J is elevated, that is, the value of Kiiis diminished. When a high, fixed concentration of…The effect of high levels of ADP is to_inv_cellular respiration. a. increase the activity of specific enzymes b. decrease the activity of specific enzymes c. have no effect on the activity of specific enzymes d. slow down the pathway