Question

multiple choice question

what compound is composed of a heme (iron containing) component which can shuttle electrons through the ets during respiration?

nadh
cytochrome
\\(\text{fadh}_2\\)
atpase

Explanation:

Identify the key characteristics of the target compound

The question asks for a compound containing a heme (iron-containing) group that shuttles electrons through the electron transport system (ETS) during respiration.

Evaluate the given options

• NADH: A soluble electron carrier (coenzyme) derived from niacin; does not contain a heme group.
• Cytochrome: A class of membrane-bound hemoproteins containing heme groups (iron-porphyrin complexes) that undergo reversible redox reactions to transfer electrons in the ETS.
• FADH₂: A prosthetic group/electron carrier derived from riboflavin; does not contain a heme group.
• ATPase: An enzyme complex (ATP synthase) that synthesizes ATP using a proton gradient; does not function as an electron shuttle in the ETS and does not contain heme.

Select the correct option

Based on the presence of a heme group and its role in electron transport, cytochromes are the correct compounds.

Answer:

• NADH
• Cytochrome (Correct answer)
• \(\text{FADH}_2\)
• ATPase