- True or false: in aerobic organisms, all of the ATP that can be produced through glucose catabolism in the absence of O2 comes from glycolysis.
0.5 pointsQuestion 2
- Which of the following pathways DOES NOT require O2?
- Pyruvate oxidation
- The Citric Acid Cycle
- Electron transport system
- All of the above
- None of the above
0.5 pointsQuestion 3
- Which of the following lists major reactants for the Light-dependent reactions?
- Sunlight, H2O, CO2
- Sunlight, ADP, NADP+, H2O, O2
- Sunlight, ADP, NADP+, H2O
- Sunlight, ATP, NADPH, O2
0.5 pointsQuestion 4
- How are the Light-dependent reactions of photosynthesis similar to the electron transport system in aerobic metabolism?
- They both involve generation of a proton gradient that is harnessed to produce ATP.
- Reduced coenzymes donate their electrons to the electron transport system, which harnesses the energy to produce a proton gradient.
- They both use O2 as the final electron acceptor.
- All of the above.
0.5 pointsQuestion 5
- The major carbohydrate-derived reactant of fermentation is ____; and during fermentation this compound is _____.
- Lactate; oxidized
- Ethanol; oxidized
- Pyruvate; reduced
- Citric acid; reduced
0.5 pointsQuestion 6
- Phosphofructokinase (PFK-1) is one of the most regulated enzymes in metabolism. Which of the following would be expected to be an allosteric activator of PFK-1?
- Acetyl CoA
- Citric acid
0.5 pointsQuestion 7
- In the 1930's 2,4-dinitrophenol (DNP; shown below) was introduced to the market as a diet drug. DNP is a chemiosmotic "uncoupler" just like uncoupling protein (UCP) in brown fat. Uncouplers make the inner mitochondrial membrane permeable to protons (H+), causing them to flow down their concentration gradient without going through F0 and thereby bypassing the F1 ATP Synthase. As a result, the mitochondria fails to produce ATP when it breaks down glucose. DNP causes protons (H+) to flow:
- From the intermembrane space to the cytoplasm.
- From the intermembrane space into the mitochondrial matrix.
- From the cytoplasm to the intermembrane space.
- From the mitochondrial matrix to the intermembrane space.
0.5 pointsQuestion 8
- DNP was a very effective diet aid introduced in the 1930's, but it was nearly immediately taken off the market after several users died of acute hyperthermia (overheating). Why would DNP cause hyperthermia?
- Individuals taking it would have the sensation of increased energy and would therefore become extremely physically active, increasing their body temperature.
- The energy resulting from the increased metabolic rate would be released as heat.
- Protons flowing down their concentration gradient is an exergonic process, the energy from which, when not captured by ATP Synthase, is released as heat.
- Rapid oxidation of NADH and FADH2 would be uncoupled from proton transport and the energy from these reactions would be released as heat.
0.5 pointsQuestion 9
- Assuming O2 is available, in which of the following structures would you expect to see the highest pH?
- The intermembrane space of the mitochondria
- The mitochondrial matrix
- The cytoplasm
Assuming O2 is available, in which of the following structures would you expect to see the lowest pH?
The intermembrane space of the mitochondria
The mitochondrial matrix
answers: 1) true 2) 2 3) 4... View the full answer
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in aerobic organisms, all of the ATP that can be produced through glucose catabolism in the absence of O 2 comes from... View the full answer