Question

Using these:

CO₂/glucose = -0.43

2H⁺/H₂ = -0.42

NAD+/NADH = -0.32

S⁰/H₂S = -0.27

CO₂/CH₄ = -0.24

pyruvate/lactate = -0.19

FAD/FADH₂ = -0.18

NO₂ -/NH₄⁺ = +0.44

Fe³⁺/Fe²⁺ = +0.771

NO₃ -/N₂ = +0.74

O₂/H₂O = +0.815

• If members of the redox couples above were used to set up the most energetically favorable chemical reaction, the initial electron donor should be _____________ and the final electron acceptor should be __________________.
• If an organism were a chemolithoautotroph that is a facultative anaerobe, the best initial electron donor would be: _______________________________, while the best final electron acceptor would be: _________________________________________.
• If a bacterium were a chemolithotrophic nitrate-reducer, the best initial electron donor would be: ________________________. acceptor would be: ________.
• If a bacterium were an iron-reducing, oxidizer of sulfur compounds, the best initial electron donor would be: _______________________, while the best final electron acceptor would be: ________________________________________________. Based on the redox couple, the products produced would be: ______________________ and _______________________

I got but just wanted to check my answers

1. Glucose and O2
2. H2 and O2 (since facultative anaerobes can use O2 for final)
3. NH4+ and O2
4. H2S and Fe+4, products of S zero and Fe+4

Answer 1

- If members of the redox couples above were used to set up the most energetically favorable chemical reaction, the initial electron donor should be Glucose and the final electron acceptor should be Oxygen.

- If an organism were a chemolithoautotroph that is a facultative anaerobe, the best initial electron donor would be Hydrogen, while the best final electron acceptor would be Oxygen

- If a bacterium were a chemolithotrophic nitrate-reducer, the best initial electron donor would be nitrate and acceptor would be Oxygen.

- If a bacterium were an iron-reducing, oxidizer of sulfur compounds, the best initial electron donor would be H2S while the best final electron acceptor would be iron.

- Based on the redox couple, the products produced would be FADH2, NADH2, NH4+.