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10 Cards in this Set

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Several coenzymes play an important role in cell respiration. As mentioned way back in chapter 5 (lipids), coenzymes may be made from ___? One example is NAD, which is nicotinic acid or "niacin"
Vitamins
What coenzyme is used as an oxidizing agent during the first 3 stages of cellular respiration?
NAD+
How many different enzymes run the citric acid cycle?
8
which of the first 3 stages of cellular respiration does NOT produce ATP?
Pyruvate Oxidation
Which of the first three stages of cellular respiration does NOT produce NADH+?
a) glycolysis, b) pyruvate oxidation, c) citric acid cycle?
d) None of these answers are correct
As discussed at the end of chapter 8, enzymes or other proteins involved in a metabolic pathway may be LOCALIZED so that they function more efficiently or in specialized capacities. The following is (are) an example (s) from cellular respiration:

a) the enzymes of pyruvate oxidation are bound together in a multi-enzyme complex
b) Citric acid cycle enzymes are located in the mitochondrial matrix
c) electron transport chain proteins and ATP synthase are embedded in the inner membrane of the mitochondria
d) all of these answers are correct
d) all of these answers are correct

b/c localizing enzymes of a pathway helps to concentrate the enzymes with their reactants and makes the pathway more efficient
what type of gradient is created across the mitochondrial inner membrane during the last stage of cellular respiration?
Proton gradient
In what subcellular compartment specifically are protons concentrated during cellular respiration?
Mitochondrial intermembrane space

* mitochondrion only has 2 membranes and 2 aqueous compartments
The TRANSFORMATION of the energy of a proton gradient into the energy of ATP is a demonstration of the --------?
The first law of thermodynamics

energy cannot be created or destroyed; ONLY TRANSFORMED
In addition to being an enzyme, ATP synthase is a ----------?
Membrane transport protein