46.Enzym atic pathways are tightly controlled by feedback mechan a. the initial

Question

46.Enzym atic pathways are tightly controlled by feedback mechan a. the initial reactants regulate the process. b. the e products early in the pathway act as activators c the final product acts as an activator early in the pathway d. the final product acts as an inhibitor early in the pathway e. random molecules attached to sites on enzymes in the pathway 47. In allosteric activation and inhibition mechanisms a. enzymes are physically linked together b. the complex osciliates between on" and "off states c. activators bind to allosteric sites, keeping active sites oper. d. inhibitors bind to allosteric sites, locking the complex in closed state. e. All statements are true. 48. Life on Earth persists because a. sunlight fuels cellular respiration every day. b. sunlight fuels photosynthesis every day c. electrons are donated and accepted by many different carriers. ATP can be made by digesting glucose. e. we haven't reached equilibrium yet 49. Which reaction best describes the role of O2 in cellular respiration? a. donates 2 e- and binds to 2 H+ to form water b. accepts 2e-from the e- carriers and forms water with 2H+ c. donates 2 e-from the terminal e- acceptor in the electron chain accepts 2 e-from the terminal carrier in the electron transport chain it powers the proton pump, creating the gradient that powers ATP synthase. d. e. to 50. In the initial reactions of glycolysis, 2 ATP are invested in order break open and destabilize glucose: quickly divide the 6-C sugar into 2 3-C molecüle c. make things more interesting d. provide a pathway to the Kreb's Gycle e. to make more NADH

Explanation / Answer

46-D(ORgranism control biosynthetic pathway by feedback inhibition,this control adjusts the rate of production of end product of pathway ,control is imposed by nd product itself in simple and rapid manner,

47-B

48-E

49-D

50-D

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