4 ???? The inner mitochondrial membrane is impermeable to protons, but protons m
ID: 856989 • Letter: 4
Question
4 ????
The inner mitochondrial membrane is impermeable to protons, but protons move through the membrane -- through various protein complexes. Which of the following is NOT a protein through which protons move (in one direction or another) through the inner mitochondrial membrane?
A. Complex I
B. Complex II
C. Complex III
D. Complex IV
E. ATP synthase
Point Value: 3
23.This question has not been answered completely
One of the most important advances in biochemistry in the last half-century or so has been the discovery of the "proton-motive" force. Which of the following is TRUE about the proton-motive force.
A. This is created across a biological membrane that is impermeable to protons.
B. The proton-motive force is created by "pumping" protons out of the mitochondrial matrix and into the intermembrane space.
C. The proton motive force has a chemical component - a gradient in a chemical species.
D. The proton motive force has an electrical component -- from a charge gradient.
E. All of the above are true.
Point Value: 3
24.This question has not been answered completely
Oxidative phosphorylation has two parts: the "ox" (electron transport) and the "phos" (ATP synthesis).
Which of the following is FALSE about ATP synthesis in oxidative phosphorylation.
A. In analogy with reactions 7 and 10 of glycolysis and reaction 6 of the citric acid cycle, ATP synthesis in oxidative phosphorylation is driven by a high-energy chemical compound.
B. ATP synthase is an integral membrane protein of the inner mitochondrial membrane.
C. ATP synthase has channel or pore for the passage of protons through a membrane.
D. ATP synthesis in oxidative phosphorylation is "powered" by the proton-motive force.
Point Value: 3
25.This question has not been answered completely
Which of the following is FALSE about calculating the yield of ATP equivalents from the complete aerobic catabolism of glucose?
A. The yield of ATP per glucose is about 30.
B. In calculating the yield of ATP, we use a value of 2.5 ATP produced per NADH oxidized in oxidative phosphorylation.
C. NADH produced in the pyruyvate dehydrogenase reaction leads to production of fewer ATP (per NADH) than does NADH produced in the citric acid cycle (per NADH).
D. The direct (so-called "substrate level") production of ATP in glycolysis is 2 ATP (net) per glucose.
Explanation / Answer
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