Which of the following is an important rule to follow when enumerating leukocytes?
A) The difference between any two counts should be less than 10, and the difference between the highest and lowest count should be less than 15.
B) The mean of the four counts on one side of the hemacytometer should be less than 10 units different from the mean of the four counts on the other side of the hemacytometer.
C) The total count from one side of the hemacytometer should differ from the total count on the other side of the hemacytometer by at least 20.
D) The values obtained from one side of the hemacytometer should be identical to those obtained from the other side of the hemacytometer.
Question 2
Which of the following is true regarding the unit mole?
A) If the masses of two atoms differ, then a mole of one substance will weigh more than a mole of the other.
B) Because the number of atoms in a mole is constant, one mole of any substance has the same weight as does one mole of any other substance.
C) The unit mole uses the standard of one mole of carbon-12, because one mole of carbon-12 is the heaviest substance known.
D) Both A and C are correct.
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