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Electron Transport Chain in Cellular Respiration

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Questions and Answers

Why is anaerobic respiration mostly relegated to oxygen-free environments?

Anaerobes prefer oxygen as an electron acceptor.
Anaerobic respiration releases more energy in the presence of oxygen.
Oxygen is poisonous to many anaerobes. (correct)
Anaerobes are highly resistant to oxygen.

What governs the selection of TEAs in anaerobic respiration?

Light intensity
Atmospheric pressure
Temperature
Free energy yields (correct)

Which of the following is NOT a commonly available TEA in anaerobic environments?

Nitrate
Carbon dioxide (correct)
Oxygen
Ferric iron (Fe(III))

What does PED stand for in the context of respiration?

Primary Electron Donor (C) Signup and view all the answers

What mainly determines the use of a particular PED in respiration?

Free energy yields associated with its reaction with TEAs (B) Signup and view all the answers

Which of the following is an example of a less abundantly available TEA?

Sulfate (A) Signup and view all the answers

What is the primary reason for using specific electron acceptors in anaerobic respiration?

To generate ATP through phosphorylation (A) Signup and view all the answers

What role do organic compounds play in respiration?

Organic compounds serve as primary electron donors. (B) Signup and view all the answers

Which of the following is not a commonly used TEA in anaerobic respiration?

Hydrogen sulfide (B) Signup and view all the answers

What factor primarily determines the choice of electron acceptors in anaerobic respiration?

Free energy yield from reactions (C) Signup and view all the answers

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