Textbook Question
The diagram that follows represents a molecular view of a process occurring at an electrode in a voltaic cell.
(c) Why are the atoms in the electrode represented by larger spheres than those in the solution? [Section 20.3]
20. Electrochemistry
Intro to Electrochemical Cells
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Join thousands of students who trust us to help them ace their exams!Watch the first videoMultiple Choice
Which complex is not involved in producing the electrochemical gradient for ATP synthesis in the electron transport chain?
A
Complex II
B
Complex I
C
Complex IV
D
Complex III
Verified step by step guidance1
Understand the role of the electron transport chain (ETC) in cellular respiration. The ETC is a series of protein complexes located in the inner mitochondrial membrane that transfer electrons from electron donors to electron acceptors via redox reactions.
Recognize that the main function of the ETC is to create an electrochemical gradient across the inner mitochondrial membrane. This gradient is used by ATP synthase to produce ATP from ADP and inorganic phosphate.
Identify the complexes involved in the electron transport chain: Complex I, Complex II, Complex III, and Complex IV. These complexes facilitate the transfer of electrons and contribute to the proton gradient.
Note that Complex II is unique because it does not pump protons across the membrane. It transfers electrons from succinate to ubiquinone but does not contribute to the electrochemical gradient necessary for ATP synthesis.
Conclude that Complex II is the complex not involved in producing the electrochemical gradient for ATP synthesis, as it does not contribute to the proton gradient across the inner mitochondrial membrane.
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