Questions: FMN accepts electrons from NADH at which site of the electron transport chain? Site 4 Site 1 Site 3 Site 2 The Iron-Sulfur clusters that accept and pass along electrons are found at which 2 sites in the electron transport chain? Site 1 Site 2 Site 4 Site 3

The answer to the first question is Site 1.

Explanation: FMN (Flavin mononucleotide) accepts electrons from NADH at Complex I (Site 1) of the electron transport chain. Complex I is also known as NADH:ubiquinone oxidoreductase. It is the first complex in the electron transport chain and is responsible for the transfer of electrons from NADH to FMN, and subsequently to a series of iron-sulfur (Fe-S) clusters, eventually passing the electrons to ubiquinone (coenzyme Q).

For the second question, the Iron-Sulfur clusters that accept and pass electrons are found at Site 1 and Site 2.

Explanation: Iron-Sulfur clusters are found in multiple complexes of the electron transport chain. Specifically:

• Site 1 (Complex I): Contains several iron-sulfur clusters that facilitate the transfer of electrons from FMN to ubiquinone.
• Site 2 (Complex II): Also known as succinate dehydrogenase, contains iron-sulfur clusters that transfer electrons from succinate to ubiquinone.

Summary:

1. FMN accepts electrons from NADH at Site 1 (Complex I) of the electron transport chain.
2. Iron-Sulfur clusters that accept and pass electrons are found at Site 1 (Complex I) and Site 2 (Complex II) of the electron transport chain.