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Exam 14: Electron Transport and Atp Synthesis

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Question 31

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How many protons are translocated across the membrane by complex I for every pair of electrons that are passed from NADH to QH₂?

A) 1
B) 2
C) 3
D) 4
E) 5

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Question 32

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A muscle cell from an alligator jaw contains more mitochondria than a wing muscle of a migrating bird such as a goose.

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Question 33

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Iron sulfur clusters (Fs-S) that can accept or donate one electron are found in which complexes of the electron transport chain?

The chemiosmotic theory is a concept that ________.

The ultimate electron acceptor from complex II is ________.

The human mitochondrial genome contains genes for all of the complexes necessary for electron transport and oxidative phosphorylation.

Superoxide dismutase protects cells from damage caused by ________.

According to the binding change mechanism,the (alpha3 beta3 ) oligomer of ATP synthase containing 3 catalytic sites can each have ________ different conformations.

Complex I contains a porin protein subunit that transports H+ across the inner mitochondrial membrane.

Which is a component of complex I?

Membrane- associated electron transport complexes I and II are linked by ubiquinone (Q)while complexes II and IV are linked by cytochrome c.

Which statement is not true about the transport of ATP across the inner mitochondrial membrane on its way to the cytosol?

The synthesis of one molecule of ATP from ADP requires ________ to be translocated across the inner mitochondrial membrane.

Mitochondrial electron transport and ATP formation are interdependent.

The numbers of mitochondria in cells is closely associated with cell function.

ATP directly provides the energy to transport protons across the inner membrane from the matrix to the intermembrane space of mitochondria.

Which of the following substances can freely pass through the inner mitochondrial membrane?

What is the Gibbs free energy change,△G,across a membrane with a pH difference of 0.50 and a membrane potential of -0.10 V at 310 K? (R = 8.315 J K-1 mol-1;F = 96,485 J V-1 mol-1)

The P/O ratio is independent of whether electrons originate from complex I or complex II.

A lipid-soluble cofactor that can diffuse freely in the membrane of the electron transport chain and carry electrons across the membrane is ________.