I need help in my bio quiz that is due in an hour. Please help asap, thank you!

Question

I need help in my bio quiz that is due in an hour. Please help asap, thank you! From 35-39 please last question I have 34. Which of the following statements about the respiratory electron transport chain is false? 2 points) a. Electrons are received from NADH and FADH2 b. Electrons are passed from recipient to donor carrier molecules in a series of endergonic reaction c. The terminal electron acceptor is usually O d. Most of the enzymes are part of the inner mitochondrial membrane e. All of the above 35. The proton-motive force is released by the (2 points) a. ATP synthase b. the proton concentration gradient and electric charge difference across a membrane a metabolic pathway in the cell. a redox reaction that uses electrons from NAD. None of the above c. d. e. 36. When hydrogen ions are pumped from the mitochondrial matrix across the inner into the intermembrane space, the result is the (2 points) a. formation of ATP b. reduction of NAD c. creation of a proton gradient. d. restoration of the Na*-K balance across the membrane e. reduction of glucose to lactic acid. 37. The drug 2,4-dinitrophenol (DNP) destroys the proton gradient across the inner mitochondrial membrane. What would be the effect of incubating isolated mitochondria in a solution of DNP? (2 points) a. Oz would no longer be reduced to H:O. b. ATP synthesis would decline. c. Mitochondria would show a burst of increased ATP synthesis. d. Glycolysis would stop. e. Mitochondria would switch from glycolysis to fermentation. 38. Which of the following processes occurs when Oz is available to a cell? (2 points) a. b. c. d. e. Pyruvate oxidation The citric acid cycle Oxidative phosphorylation All of the above A and B 39. The fermentation process in yeast produces (2 points) a. lactie acid. b. 12 moles of ATP. c. pyruvic acid d. an excessive amount of energy e. None of the above

Explanation / Answer

35.b The electrochemical gradient results in proton motive force (PMF).

36.a.Chemiosmosis is the movement of ions across a semipermeable membrane, down their electrochemical gradient. An example of this would be the generation of adenosine triphosphate (ATP)

37.b.DNP is a precursor to other chemicals and is biochemically active, inhibiting energy (adenosine triphosphate, ATP) production in cells with mitochondria.

38.d.The other three stages of cellular respiration—pyruvate oxidation, the citric acid cycle, and oxidative phosphorylation—require oxygen in order to occur.

39.e.Yeast organisms consume sugars and produce ethanol and carbon dioxide as waste products.

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