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relevant passage information:
My question is, if glucose concentration in the urine increases as the enzymes become saturated, then wouldn't you expect logarithmic growth (answer c)
TBR Bio chapter 3 passage VI question 45
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relevant passage information:
My question is, if glucose concentration in the urine increases as the enzymes become saturated, then wouldn't you expect logarithmic growth (answer c)
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No, glucose concentration in the urine does not increase as the transporters (not enzymes) become saturated. Glucose should never appear in the urine if the transporters are not saturated -- flat segment in D.
Once the transporters are saturated, though, excess glucose will be excreted according to their concentrations because the transporters can only keep up to a certain max rate -- a linear relationship in D.
Once the transporters are saturated, though, excess glucose will be excreted according to their concentrations because the transporters can only keep up to a certain max rate -- a linear relationship in D.
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While graph D is the "best" answer, I think this question is a bad one. D does fit the description of ~0 excretion until the saturation of the transporters. However, I think the fact that the answer choices have 2 graphs (choices) starting at 0 for glucose excretion rate and the correct answer for this question starting above 0 glucose excretion rate makes this question very confusing because you REALLY should assume there is 0 glucose excretion unless there is a problem.
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