The Friedewald equation is used to calculate the concentration of LDL cholesterol in a sample. In cases of suspected lipid disorders, the Friedewald equation should not be used. Which of the following explains why?
A) In lipid disorders, the measure of total cholesterol frequently is less than the measure of HDL, resulting in a negative LDL value.
B) LDL values obtained from the Friedewald equation do not include the concentration of solid, crystalline LDL.
C) The calculation does not take into account interfering concentrations of gaseous CO2.
D) The Friedewald equation assumes that nearly all the circulating TG is in VLDLs.
Question 2
A solution of pure water is placed on the left side of a chamber. A solution of 10 mol/L glucose in water is placed on the right side of the chamber. A semi-permeable membrane that only permits water to pass is placed between the two chambers.
After five minutes there has been a net movement of water to the right chamber. Which of the following best explains why?
A) The water moves because it is attracted to the negatively charged glucose molecules.
B) The water moves to absorb the free glucose molecules.
C) The water moves to evenly distribute the pressure of the glucose molecules.
D) The water moves to reduce the difference in the concentration of the two solutions.
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