1. Model 1 and 2 show structures of the four electron carriers in the ETC: iron-sulfur proteins, cytochrome, FMN, and coenzyme Q. Which of these are proteins?
2. Which electron carriers in the ETC are coenzymes?
3. Which of the four types of electron carriers in the ETC are one-electron carriers?
4. Which of the four types of electron carriers in the ETC are two-electron carriers?
5. a. When an electron is transferred to an atom or molecule, does the atom or molecule become more oxidized or more reduced? Explain, using the definition of oxidation or reduction.
b. Does the atom or molecule which donated the electron become more oxidized or reduced?
6. Consider the electron carriers in Model 1. Which form of iron Fe3+ or Fe2+ is more oxidized? which is more reduced? Explain how you can tell.