What is the correct order of electron transport compounds from best electron donor to best electron acceptor?
NADH -- Fe-S of Complex I -- Q -- Fe-S of Complex III -- Cyt c-- Cyt a of Complex IV -- $O _2$
$O _2$-- Fe-S of Complex I -- NADH -- Q -- Fe-S of Complex III -- Cyt c -- Cyt a of Complex IV
$O _2$-- Cyt a of Complex IV -- Cyt c -- Fe-S of Complex III -- Q -- Fe-S of Complex I -- NADH
NADH -- Cyt c -- Fe-S of Complex I -- Q -- Fe-S of Complex III -- Cyt $a$ of Complex IV-- $O _2$
Answer (2)
The electron transport chain involves a series of electron carriers.
The order is determined by the reduction potentials of the carriers.
The correct order from best electron donor to best electron acceptor is: NADH, Fe-S of Complex I, Q, Fe-S of Complex III, Cyt c, Cyt a of Complex IV, O 2 .
The correct sequence is NADH – Fe-S of Complex I – Q – Fe-S of Complex III – Cyt c – Cyt a of Complex IV – O 2 .
Explanation
Understanding the Problem We need to determine the correct sequence of electron carriers in the electron transport chain, ordered from the best electron donor to the best electron acceptor. This order is determined by the reduction potentials of the carriers.
Identifying the Correct Order The electron transport chain involves a series of electron carriers that pass electrons from one to another. The order is:
NADH (best electron donor)
Fe-S of Complex I
Q (Ubiquinone)
Fe-S of Complex III
Cyt c (Cytochrome c)
Cyt a of Complex IV
O 2 (best electron acceptor)
Determining the Correct Sequence Therefore, the correct order is:
NADH -- Fe-S of Complex I -- Q -- Fe-S of Complex III -- Cyt c -- Cyt a of Complex IV -- O 2
Final Answer The correct order of electron transport compounds from best electron donor to best electron acceptor is NADH -- Fe-S of Complex I -- Q -- Fe-S of Complex III -- Cyt c -- Cyt a of Complex IV -- O 2 .
Examples
The electron transport chain is similar to a bucket brigade, where each person passes a bucket of water (electrons) to the next. In this chain, NADH starts by donating electrons, and each subsequent carrier accepts and passes them along until they reach oxygen, the final acceptor. This process is crucial for generating energy in our cells, much like a power plant generates electricity.
The correct order of electron transport compounds from best electron donor to best electron acceptor is NADH, Fe-S of Complex I, Q, Fe-S of Complex III, Cyt c, Cyt a of Complex IV, and O₂. This sequence is crucial for the function of the electron transport chain in cellular respiration. Each component plays a specific role in shuttling electrons to ultimately produce ATP and water.
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