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Test your basic knowledge |
Chemistry Certification
Start Test
Study First
Subject
:
certifications
Instructions:
Answer 50 questions in 15 minutes.
If you are not ready to take this test, you can
study here
.
Match each statement with the correct term.
Don't refresh. All questions and answers are randomly picked and ordered every time you load a test.
This is a study tool. The 3 wrong answers for each question are randomly chosen from answers to other questions. So, you might find at times the answers obvious, but you will see it re-enforces your understanding as you take the test each time.
1. The formula for calculating absorbance given the percent transmittance (%T) of a solution
4.5
TLC
2-log(T)
bicarbonate carbonic acid
2. Amniotic fluid submitted for a lecithin/sphingomyelin (US) ratio has been left in a brown container since the night before. You would expect...
decreased lecithin
dirty applicators
breast cancer
monitoring the course of a known cancer
3. A person suspected of having metabolic alkalosis would have these laboratory findings
metabolic acidosis
CO2 and pH elevated
carbohydrate hyperalimentation
A1
4. On immunoassays using enzyme-labeled antibodies or antigens: ___________ can be carried out with a spectrophotometer
porphobilinogen synthetase
21-hydroxylase deficiency
amylase
quantitation of label
5. About 90% of phenytoin is excreted in the urine as...
para-hydroxylphenyl...
hyperthyroidism
alpha 2 beta
dirty electrodes
6. The ability of a procedure to measure only the component(s) it claims to measure is called...
glycerol
pCO2
methadone
specificity
7. In the fasting state - the arterial and capillary blood glucose concentration varies from the venous glucose concentration by approximately how many mg/dL?
1 micromole per minute
bicarbonate carbonic acid
transferrin
5mg higher
8. In the Jaffe reaction - creatine reacts with...
absorptivity x light path x concentration
5mg higher
65
alkaline picrate
9. The test for adrenal cortical hyperfunction that has the greatest diagnostic sensitivity is measurement of...
urinary free cortisol
albumin
attaching them to protein molecules
CO2
10. A test request slip indicates that an acute porphyric attack is suspected clinically. Analysis should include...
porphobilinigen SCREEN
potassium dichromate in SA
TSH
serum aliquots - one heated
11. One means of checking a spectrophotometer wavelength calibration in the visible range is by using a...
spun separated iced and tested immediately
didymium filter
(testing of urine for) delta-am.. acid
monitoring the course of a known cancer
12. If the correlation coefficient (r) of two variables is zero...
parathyroid hormone
there is an absence of correlation
O2
alkaline picrate
13. The principle of the occult blood test depends on the...
CK-MB
peroxidase-like activity of hemoglobin
128
TLC
14. Ion selective electrodes are called selective rather than specific because they actually measure the...
L/S ratio > 3.5
glucose
measures one ion more than others
591
15. The selectivity of an ion-selective electrode is determined by the...
40-50
run a new set of controls
properties of the membrane
LDH
16. A patient with glomerulonephritis would present the following serum results...
Tangier
boderline results test should be repeated
monitoring the course of a known cancer
BUN increased
17. Most drugs and intracellular metabolites measured by radioimmunoassay have molecular weights between 200 and 1000 and can be made immunogenic by...
properties of the membrane
fall in pH - rise in pCO2
attaching them to protein molecules
porphyrin and porphobilinogen screen
18. To ensure an accurate ammonia level result - the specimen should be...
lipase
improving state of metabolic control (as indicated by fructosamine)
spun separated iced and tested immediately
faster than gamma
19. Currently the most common method for specific identification and quantitation of serum barbiturates is...
a small concentration of APO-B containing lipoproteins after precipitation
sodium
A1c
GLC
20. In electrophoresis of proteins - when the sample is placed in an electric field connected to a buffer of pH 8.6 - all of the proteins...
normal - liver breakdown
have a negative charge
ALP with fresh draw
maintain colloidal osmotic pressure
21. Bromcresol purple at a pH of 5.2 is used in a colorimetric method to measure...
beta
enzyme immunoassay
albumin
bicarbonate carbonic acid
22. Unless blood gas measurements are made immediately after sampling - in vitro glycolysis of the blood causes a...
128
crigler
fall in pH - rise in pCO2
conjugated hyperbilirubinemia - hepatocellular obstruction
23. This condition does decrease activity of glucuronyl transferase result in increased unconjugated bilirubin and kernicterus in neonates
parathyroid hormone
crigler
biuret
ratio of distance moved by solvent to distance moved by compound
24. The most common type of congenital adrenal hyperplasia associated with increased plasma concentrations of 17 a-hydroxyprogesterone and increased urinary excretion of pregnanetriol is...
5
21-hydroxylase deficiency
band width
SD over mean
25. Aminotransferase enzymes catalyze the...
exchange of amino and keto groups
coulometry
cancel test
methadone
26. Most most likely to be ordered in addition to serum calcium to determine the cause of tetany?
bilirubindiglucuronide
acute hepatitis
beta
Mg
27. The osmolal gap is defined as measured Osm/kg minus the calculated Osm/kg. The average osmolal gap is near...
parathyroid hormone
0
pilocarpine
sodium
28. The Porter-Silber method (phenylhydrazine in alcohol and sulfuric acid) involves which part of the steroid molecule?
dihydroxyacetone side chain
peroxidase-like activity of hemoglobin
5mg higher
draw blood for glucose and discontinue test
29. Sixty to seventy-five percent of the plasma cholesterol is transported by...
prostate
LDL
urinary free cortisol
5 tri 15 cholesterol 50 protein
30. When taken by a euthyroid individual - oral contraceptives containing estrogens will have this effects on the thyroid function studies
iron deficiency anemia
increase in total circulating T4
cholesterol normal triglycerides elevated
quantitation of label
31. In a normal individual - injection of thyrotropin-releasing hormone (TRH) causes an increase in blood concentrations of this hormone
enzyme induction
attaching them to protein molecules
Prolactin
acute intermittent porphyria
32. An electrode has a silver/silver chloride anode and a platinum wire cathode. It is suspended in KCl solution and separated from the blood to be analyzed by a selectively permeable membrane. Such an electrode is used to measure...
@ 100
draw blood for glucose and discontinue test
O2
increased vasoconstriction
33. Most automated blood gas analyzers directly measure...
128
pH pCO2 pO2
biuret
emphysema
34. In developing the reference for a new EIA for CEA - the range for the normal population was broader than that published by the vendor. Controls are acceptable with a narrow coefficient of variation. This may be explained by...
Tay-sachs
pilocarpine
100nmol
inclusion of smokers and nonsmokers in the study population
35. One international unit of enzyme activity is the amount of enzyme that - under specified reaction conditions of substrate concentration - pH - and temperature - causes utilization of substrate at the rate of...
draw blood for glucose and discontinue test
dirty applicators
increased O2 decreased HCO3
1 micromole per minute
36. Before unconjugated bilirubin can react with Ehrlich's diazo reagent - this must be added
methyl alcohol
100 nmol
thymolpthalein monophosphate
methadone
37. Hydrogen ion concentration (pH) in blood is usually determined by means of these electrodes?
endosmosis
primidone
ALP with fresh draw
glass
38. In electrophoresis of serum proteins - arifacts at the application point are most frequently caused by...
amylase
Tay-sachs
dirty applicators
B12 deficiency
39. Assay of transketolase activity in blood is used to detect deficiency of...
thiamine
4.5
0
200x affinity for oxygen
40. The osmolality of a urine or serum specimen is measured by a change in the...
freezing point
carbohydrate hyperalimentation
act as carriers for ions
effluent line is obstructed
41. A one MOLAL solution is equivalent to...
sample exposed to light
1 mol/kg
CK
conjugated hyperbilirubinemia - hepatocellular obstruction
42. A blood gas sample was sent to the lab on ice - and a bubble was present in the syringe. The blood had been exposed to room air for at least 30 minutes. The following change in blood gases occurred...
parathyroid hormone
5 tri 15 cholesterol 50 protein
pO2 increased HCO3 decreased
peptide bonds
43. The following laboratory results were obtained: Serum Calcium: Increased - Urine Calcium: Increased - Serum Phosphate: Decreased - Urine Phosphate: Increased Serum Alkaline Phosphatase: Normal or Increased These results are most compatible with...
boderline results test should be repeated
bicarbonate buffer
correct for variations in light intensity
primary hyperparathyroidism
44. Clinical assays for tumor markers are the most important for...
monitoring the course of a known cancer
quantitation of label
crigler
hemolysis
45. Upon development of a thin layer chromatogram for the drug analysis - all drug spots (including the standards) had migrated with the solvent front. The most probable cause for this would be...
incorrect aqueous to nonaqueous mixture
parathyroid
1 mol/kg
F
46. The relative migration rate of proteins on cellulose acetate is based on...
the fetus is at risk for respiratory distress
Temperature is a function of the number of particles in solution
ionic charge
9
47. The urea nitrogen concentration of a serum sample was measured as 15 mg/dL (atomic weights: carbon = 12 - oxygen = 16 - nitrogen = 14 - hydrogen = 1). The urea concentration of the same sample - in mg/dL - is...
pCO2
32
growth - third trimester of pregnancy
measurement of absorbance at 450
48. An acid cleaning solution for glassware consists of...
200x affinity for oxygen
potassium dichromate in SA
emphysema
<1%
49. The protein portion of an enzyme complex is called the...
g/MW
bilirubin
metabolic acidosis
apoenzyme
50. A 45-year-old woman has a fasting serum glucose concentration of 95 mg/dL and a 2-hour postprandial glucose concentration of 105 mg/dL. The statement that best describes this patient's fasting serum glucose concentration is...
Hb S
normal - liver breakdown
effluent line is obstructed
plasma bicarbonate