The number of molecules of carbon dioxide produced by three turns of the Krebs cycle would be:

1.	3	2.	6
3.	12	4.	18

What is the total number of NADH and ${\mathrm{FADH}}_2$ molecules produced for each molecule of glucose metabolized by glycolysis and the citric acid cycle?

The correct sequence of electron flow during aerobic respiration would be:
1. food → Krebs cycle → ATP → NAD⁺
2. food → NADH → electron transport chain → oxygen
3. glucose → pyruvate → ATP → oxygen
4. glucose → ATP → electron transport chain → NADH

Electron is donated to the mitochondrial ETC at the lowest energy level by:

When electron pass downhill in the ETC, the energy released is used to pump protons into:
1. matrix of mitochondria
2. cytosol
3. mitochondrial inner membrane
4. mitochondrial intermembrane space

ATP synthesis during oxidative phosphorylation in mitochondria is directly driven by:
1. oxidation of glucose.
2. electron transport downhill in the ETC.
3. terminal transfer of electrons to oxygen.
4. chemiosmosis.

Let us say there are 30 NADH and 12 ${\mathrm{FADH}}_2$ in a mitochondrion. What is the maximum number of ATP generated if all dinucleotides are used in chemiosmosis?

The correct chronological sequence of the stages of the glycolytic pathway is:

Chemiosmosis is coupled to energy storage by:

Ubiquinone is:
1. a protein in the mitochondrial electron transport chain
2. a substrate for synthesis of FADH
3. a vitamin used as coenzyme in Krebs cycle
4. a small hydrophobic coenzyme