Question

1. unlike red blood cells, white blood cells:

a: contain hemoglobin b: live for one week
c: have a nucleus d: are biconcave

1. a line over a roman numeral means to multiply the numeral by:

a: 100 b: 1000
c: 500000 d:.01

1. the greatest source of contamination while working in a sterile environment is the:

a: laminar flow hood b: operator
c: cross contamination d: none of the above

1. what is the drug classification for coumadin?

a: anticoagulant b: tranquilizer
c: decongestant d: diuretic

1. by interpreting roman numeral lix, what would this equal in english?

a: 59 b: 21
c: 79 d: 49

Explanation:

1. Red blood cells lack a nucleus, while white blood cells have one. Hemoglobin is in red blood cells. Red blood cells are biconcave. White blood cells can live from hours to years.
2. A line over a Roman numeral means to multiply by 1000.
3. In a sterile environment, the operator (e.g., improper hand - washing, not following sterile techniques) is the greatest source of contamination. Laminar flow hoods are for maintaining sterility. Cross - contamination is a result, not the source.
4. Coumadin (warfarin) is an anticoagulant that prevents blood clots. Tranquilizers calm, decongestants reduce congestion, and diuretics increase urine output.
5. In Roman numerals, L = 50, I = 1, X = 10. LIX = 50+(10 - 1)=59.

Answer:

1. C: have a nucleus
2. B: 1000
3. B: operator
4. A: anticoagulant
5. A: 59