Question

1. In redox reactions
   1. Protons are transferred from one molecule to another
   2. One substance loses electrons and the other gains electrons
   3. A substance that loses electrons is reduced, while a substance e that gains electrons are oxidized
   4. B and c are both correct
2. Which process in eukaryotic cells will proceed normally whether oxygen (O2) is present of not?
   1. Electron transport
   2. Glycolysis
   3. The citric acid cycle
   4. Oxidative phosphorylation
   5. Chemiosmosis
3. How many carbon atoms are fed into the cirtic acid cycle as a result of the oxidation of one molecule of pyruvate?
   1. 2
   2. 4
   3. 6
   4. 8
   5. 10
4. The primary role of oxygen in cellular respiration is to
   1. Yield energy in the form of ATP as it is passed down the respiratory chain
   2. Act as an acceptor of electrons and hydrogen, forming water.
   3. Combine with carbon, forming CO2
   4. Combine with lactate, forming pyruvate
5. Energy released by the electron transport chain is used to pump H+ ions into which location?
   1. Cytosol
   2. Mitochondrial outer membrane
   3. Mitochondrial inner membrane
   4. Mitochondrial intermembrane space
   5. Mitochondrial matrix
6. The direct energy source that drives ATP synthesis during respiratory oxidative phosphorylation is
   1. Oxidation of glucose to CO2 and water
   2. The thermodynamically favorable flow of electrons from NADH to the mitochondrial electron transport chain
   3. The final transfer of electrons to oxygen
   4. The difference in H+ concentrations on opposite sides of the inner mitochondrial membrane.
7. Each time a molecule of glucose (C6H12O6) is completely oxidized via aerobic respiration, how many oxygen molecules (O2) are required?
   1. 1
   2. 2
   3. 6
   4. 12
   5. 38
8. Which of the following produces the most ATP when glucose (C6H12O6) is completely oxidized to carbon dioxide (CO2) and water?
   1. The cirtic acid cycle
   2. Oxidative phosphorylation (chemiosmois)
   3. Glycolysis and fermentation
   4. Citric acid cycle

I REALLY NEED THESE ALL ANSWERED SO I CAN STUDY FOR MY TEST ON SATURDAY

Answer 1

1. Option B

In redox reactions, there is transfer of electrons from one substance to another and not that of protons. The substance which is reduced gains an electron and the substance which is oxidized loses an electron.

2. Option B

Glycolysis is the process which is common to aerobes and anaerobes. It occurs without oxygen as well as with oxygen. In aerobic condition, glycolysis is proceded by citric acid cycle and in anaerobic condition it is proceded by fermentation, either lactic acid fermentation or alcoholic fermentation.

3. Option 1

6 carbon glucose when partially oxidized by glycolysis give rise to three carbon pyruvic acid. This pyruvic acid by further oxidation (linking reaction) give rise to 2 carbon acetyl coenzyme A which then enters tricarboxylic acid cycle.

4. Option B

5. Option 4

For question 4, and 5, please see the diagram below. I have markes important areas red.

6.Last option

During chemiosmosis, ATP synthase pumps electron from inner mitochondrial membrane to intermembrane space of mitochondria. This causes an imbalance in the number of electrons present between the two spaces, that is, inner mitochondrial membrane and intermembrane space. Due to this a proton gradient is established which then drives the ATP synthesis.

7. Option A

ATP produced by glycolysis = 8 (including ATP produced by NADH and FADH2)

By link reaction = 6

By TCA = 24

Total = 38

8. Last option

Maximum number of ATP produced by TCA, 24.

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