9. If plants are exposed to a toxin that makes the thylakoid membrane leaky to p
ID: 276805 • Letter: 9
Question
9. If plants are exposed to a toxin that makes the thylakoid membrane leaky to protons, predict the rate of ATP production by the plants. ATP production does not change. ATP production will decrease. ATP production will increase 10. Switchgrass convert CO2 to glucose, then convert glucose into cellulose. Which of the following is true about these reactions? O The reactions to make cellulose require investment of energy O These reactions are catabolic because the free energy of CO2 is greater than the free energy of cellulose O These reactions do not require any input of energy O The free energy in cellulose is lower than the free energy of glucose 11. According to the fermentation pathway shown in the figure, which of the following is true about the conversion from pyruvate to acetyl CoA? (hint: examine the cofactors of the reaction) Glucose 2 NAD 2 NADH 2P 2 CoA 2 Lactic acid 2 Pyruvate2 Acetyl-CoA 2 ADP 2ATP-.. 2 Acetyl-P 4 2 Acetic acid 2 NADH 2 Acetaldehyde Ethanol 2 2 NADH 2 NAD O acetyl CoA has more free energy than pyruvate O acetyl CoA is more oxidized than pyruvate acetyl CoA is reduced than pyruvate O acetyl CoA has less free energy than pyruvateExplanation / Answer
9. The leaky thylakoid membrane to protons will lead to The decrease in the ATP Production because the leaky membrane there will be decrease proton to electron ratio, and a increase in the proton efflux that will lead to reduction of subunit CF1-gamma of the ATP synthase. Hence less efficient proton pumping led to a decrease in the ATP yield.
10. The correct option is the free energy of cellulose is less than free energy of glucose. Due to this fact the glucose readily hydrolysed to carbon dioxide and water to produce energy as compared to the cellulose.
While rest options are false because the cellulose formation do not require energy as it is formed by condensation/polymerization of glucose. However the synthesis of glucose do require energy in the form of ATP. Reactions are not catabolic but are anabolic as the catabolic reaction means breaking of product into simpler form with release of energy.
11. The more correct answer is that the acetyl coenzyme reduced thanpyruvate because pyruvate has released its hydrogen atom to produce NADH from NAD . Loss of hydrogen is oxidation.
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