Solution to PS 3 #2

a) Oxygen consumption is a measure of the activity  of the first two stages of cellular respiration: glycolysis and the citric acid cycle.  The addition of oxaloacteate or malate stimulates the citric acid cycle and thus stimulate respiration.
b) The added oxaloacetate or malate serves a catalytic role, becuase it is regenerated in the latter part of the citric acid cycle.


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