Question 1 What is required for fermentation?

Question 1

1. What is required for fermentation?
2. O2
3. ATP
4. NADH
5. Pyruvate
6. Both NADH and pyruvate

0.5 points  

Question 2

1. Why is the activity of Phosphofructokinase (PFK-1) high at moderate concentrations of ATP and low at high concentrations of ATP?
2. When there is a lot of ATP, it gets consumed more rapidly in other processes, which decreases the ability of PFK-1 to use it.
3. ATP is a competitive inhibitor of PFK-1.
4. At high concentrations ATP is an allosteric inhibitor of PFK-1.
5. ATP phosphorylates PFK-1, inactivating it.

0.5 points  

Question 3

1. If you were to remove O2 completely from the cell's atmosphere, how would it affect the Citric Acid Cycle?
2. It would decrease its activity because O2 is a reactant in the Citric Acid Cycle.
3. It would decrease its activity because O2 is required for the reoxidation of NADH and FADH2
4. It would increase its activity because O2 is a product of the Citric Acid Cycle.
5. It wouldn't affect it because O2 is not necessary for the Citric Acid Cycle.

0.5 points  

Question 4

1. Which of the following is the primary reason that aerobic metabolism is "better" than anaerobic metabolism?
2. It consumes oxygen.
3. It results in production of CO2
4. It harnesses energy from oxidation of NADH
5. It doesn't require glucose.
6. It is catabolic

0.5 points  

Question 5

1. What are the major products of the Light-dependent reactions?
2. G3P, O2
3. H2O, ATP, NADPH
4. Glucose, H2O
5. ATP, NADPH, O2

0.5 points  

Question 6

1. Which of the following DOES NOT occur during the light-dependent reactions of photosynthesis?
2. ATP synthesis
3. Oxidation of water
4. Carbon fixation
5. Electron transport 

0.5 points  

Question 7

1. During electron transport through the electron transport system, protons (H+) get pumped from ______ to ______.
2. The intermembrane space; the matrix
3. The intermembrane space; the cytoplasm
4. The matrix; the intermembrane space
5. The cytoplasm; the intermembrane space

0.5 points  

Question 8

1. Which of the following is NOT part of the pathway for transfer of electrons from NADH through the ETS?
2. Complex I
3. Complex II
4. Complex IV
5. Ubiquinone/Coenzyme Q

0.5 points  

Question 9

1. 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:
2. From the intermembrane space to the cytoplasm.
3. From the intermembrane space into the mitochondrial matrix.
4. From the cytoplasm to the intermembrane space.
5. From the mitochondrial matrix to the intermembrane space.

0.5 points  

Question 10

1. 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?
2. Individuals taking it would have the sensation of increased energy and would therefore become extremely physically active, increasing their body temperature.
3. The energy resulting from the increased metabolic rate would be released as heat.
4. Protons flowing down their concentration gradient is an exergonic process, the energy from which, when not captured by ATP Synthase, is released as heat.
5. Rapid oxidation of NADH and FADH2 would be uncoupled from proton transport and the energy from these reactions would be released as heat.