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Questions and Answers
What is the role of heme c in cytochromes?
What is the role of heme c in cytochromes?
- It is involved in trans-membrane H+ transport coupled to e- transfer. (correct)
- It is bound to 6 sites of Fe, preventing any molecule from approaching.
- It absorbs light at characteristic wavelengths.
- It carries oxygen only.
How do hemes in the 3 classes of cytochrome (a, b, c) differ?
How do hemes in the 3 classes of cytochrome (a, b, c) differ?
- By the number of propionate side-chains.
- By the substituents on the porphyrin ring system. (correct)
- By the presence of a covalent link to the protein via thioether bonds.
- By the ability to undergo 1 e- transition between ferric and ferrous states.
Which type of transition can the heme iron undergo?
Which type of transition can the heme iron undergo?
- Transition between Fe(III) and Fe(II). (correct)
- Transition between Fe(III) and Fe(0).
- Transition between Fe(II) and Fe(I).
- Transition between Fe(II) and Fe(0).
What is a common feature among the classes of cytochrome hemes?
What is a common feature among the classes of cytochrome hemes?
What is the function of coenzyme Q (CoQ) based on the text?
What is the function of coenzyme Q (CoQ) based on the text?
What is a distinguishing factor of heme c compared to other cytochrome hemes?
What is a distinguishing factor of heme c compared to other cytochrome hemes?
Which component of the electron transport chain is responsible for transferring electrons from Complex III to Complex IV?
Which component of the electron transport chain is responsible for transferring electrons from Complex III to Complex IV?
What is the prosthetic group present in cytochromes that facilitates electron transfer?
What is the prosthetic group present in cytochromes that facilitates electron transfer?
What is the role of the isoprenoid tail in ubiquinone (CoQ)?
What is the role of the isoprenoid tail in ubiquinone (CoQ)?
Which complex of the electron transport chain is responsible for reducing oxygen to water?
Which complex of the electron transport chain is responsible for reducing oxygen to water?
What is the role of the heme prosthetic group in cytochrome c?
What is the role of the heme prosthetic group in cytochrome c?
Which component of the electron transport chain is responsible for transferring electrons from Complex I to Complex III?
Which component of the electron transport chain is responsible for transferring electrons from Complex I to Complex III?
Which of the following is the correct order of electron transfer through the cytochromes in the mitochondrial electron transport chain?
Which of the following is the correct order of electron transfer through the cytochromes in the mitochondrial electron transport chain?
What is the primary function of Coenzyme Q (CoQ) in the electron transport chain?
What is the primary function of Coenzyme Q (CoQ) in the electron transport chain?
What is the primary structural feature that allows Coenzyme Q (CoQ) to act as a mobile electron carrier?
What is the primary structural feature that allows Coenzyme Q (CoQ) to act as a mobile electron carrier?
Which of the following is NOT a function of the iron-sulfur centers in the electron transport chain?
Which of the following is NOT a function of the iron-sulfur centers in the electron transport chain?
Which of the following complexes in the electron transport chain directly links the TCA cycle to electron transport?
Which of the following complexes in the electron transport chain directly links the TCA cycle to electron transport?
What is the primary function of the heme prosthetic group in cytochrome c oxidase (Complex IV)?
What is the primary function of the heme prosthetic group in cytochrome c oxidase (Complex IV)?
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