Arrange the following electron acceptors in the proper order in which they participate in electron transport:
1 = Cytochrome c
2 = Oxygen
3 = Cytochrome c oxidase
Multiple Choice
A. 1,2,3
B. 1,3,2
C. 2,3,1
Answer (2)
Cytochrome c (1) is an electron carrier.
Cytochrome c oxidase (3) receives electrons from cytochrome c.
Oxygen (2) is the final electron acceptor.
The correct order is therefore 1 , 3 , 2 .
Explanation
Understanding the Electron Transport Chain Let's analyze the electron transport chain to determine the correct order of electron acceptors.
Identifying the Roles of Electron Acceptors The electron transport chain involves a series of electron carriers that pass electrons from one to another. Cytochrome c is an electron carrier that accepts electrons. Cytochrome c oxidase is an enzyme complex that receives electrons from cytochrome c and then transfers them to oxygen. Oxygen is the final electron acceptor in the chain, forming water.
Determining the Correct Sequence Based on their roles, the correct order is: Cytochrome c (1) donates electrons to Cytochrome c oxidase (3), which then passes the electrons to Oxygen (2). Thus, the correct sequence is 1, 3, 2.
Examples
Understanding the electron transport chain is crucial in biology and biochemistry. For example, in cellular respiration, this chain helps produce ATP, the energy currency of the cell. Knowing the order of electron acceptors helps in understanding how energy is efficiently generated in living organisms. This knowledge is also applicable in understanding metabolic disorders and developing treatments targeting specific steps in the electron transport chain.
The correct order of electron acceptors participating in the electron transport chain is Cytochrome c, followed by Cytochrome c oxidase, and finally Oxygen. The corresponding multiple choice answer is B. 1, 3, 2.
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