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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. A spectrophotometer is being considered for purchase by a small laboratory. This specification reflects the spectral purity of the instrument
band width
lead
emphysema
thiamine
2. Spectrophotometers isolate a narrow band pass by means of...
BUN 80
C3 complement
show a decrease in glycosylated hgb
prisms and grating
3. This is a glycolytic enzyme that catalyzes the cleavage of fructose-1 - 6-diphosphate to glyceraldehyde-3-phosphate and dihydroxyacetone phosphate
standard
spun separated iced and tested immediately
porphobilinogen synthetase
aldolase
4. Zinc protoporphyrin or free erythrocyte protoporphyrin measurements are useful to assess blood concentrations of...
porphobilinigen SCREEN
340
electric current
lead
5. 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...
dirty applicators
O2
hemolysis
chloride
6. 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...
increase in total circulating T4
immunofixation
have a negative charge
parathyroid hormone
7. In using ion-exchange chromatographicbmethods - falsely increased levels of Hgb A1c will be demonstrated in presence of...
sharp cutoff filter
Hb S
lead
inclusion of smokers and nonsmokers in the study population
8. A 68-year-old man arrives in the emergency room with a glucose level of 722 mg/dL and serum acetone of 4+ undiluted. An arterial blood gas from this patient is likely to indicate...
low pH
bicarbonate carbonic acid
atomic absorption
bicarbonate buffer
9. A cardiac glycoside that is used in the treatment of congenital heart failure and arrhythmias by increasing the force and velocity of myocardial contraction is...
cyclic antidepressants
binding capacity of thyroxine-binding globulin
intestinal malabsorption
digoxin
10. The most widely employed screening technique for drug abuse is...
cancel test
TLC
parathyroid hormone
carbohydrate hyperalimentation
11. This disease is associated with the greatest elevation of lactate dehydrogenase isoenzyme 1?
volumetric flask
B12 deficiency
metabolic acidosis
65
12. 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...
inclusion of smokers and nonsmokers in the study population
glucose oxidase
parathyroid hormone
GFR
13. In the fasting state - the arterial and capillary blood glucose concentration varies from the venous glucose concentration by approximately how many mg/dL?
multiplied by 4
hepatobiliary (obstruction?)
the fetus is at risk for respiratory distress
5mg higher
14. Blood samples were collected at the beginning of an exercise class and after 30 minutes of aerobic activity. This would be most consistent with the postexercise sample
run a new set of controls
correct for variations in light intensity
exchange of amino and keto groups
elevated lactic acid - elevated pyruvate
15. Which blood gas electrode is composed of calomel and glass?
breast cancer
CO2
patient noncompliance
100nmol
16. The osmolality of a urine or serum specimen is measured by a change in the...
hepatobiliary (obstruction?)
lead
freezing point
ionization of carboxyl groups (yielding a net negative charge)
17. A 45-year-old woman complains of fatigue - heat intolerance - and hair loss. Serum thyroxine and 125I-T3 resin uptake are abnormally low. What test would confirm that this is a pituitary deficiency?
act as carriers for ions
thyroxine
TSH
acid phosphatase
18. A thick white turbid specimen was received in the laboratory labeled as pericardial fluid. A microscopic examination was performed - and the differential included 90% PMNs. The fluid is...
primidone
amytriptyline 104
porphobilinigen SCREEN
purulent
19. In amniotic fluid - the procedure used to detect Rh isosensitization is...
occult blood
serum aliquots - one heated
measurement of absorbance at 450
2Na + glucose over 20 + BUN over 3
20. Regan isoenzyme has the same properties as alkaline phosphatase that originates in the...
lithium
glass
placenta
fetal and placenta function
21. Most chemical methods for determining total protein utilize this reaction?
breast cancer
1 micromole per minute
coulometry
biuret
22. In the atomic absorption method for calcium - lanthanum is used...
prevent phosphate interference
intestinal malabsorption
thiamine
respiratory acidosis
23. When the exact concentration of the solute of a solution is known and is used to evaluate the concentration of an unknown solution - the known solution is...
run a new set of controls
standard
respiratory acidosis
1 micromole per minute
24. The osmolality of a urine or serum specimen is measured by a change in the...
LDH
freezing point
intestinal malabsorption
M subunit is inactivated
25. An Rf value of 0.5 in thin-layer chromatography means...
lead
Solute moves half the distance of the solvent front
GGT
have a negative charge
26. In spectrophotometric determination - this is the formula for calculating the absorbance of a solution
enzyme induction
absorptivity x light path x concentration
atomic absorption
CO2
27. Aspartate aminotransferase (AST) and alanine aminotransferase (ALT) are both elevated in this disease
viral hepatitis
glass
apoenzyme
hepatobiliary (obstruction?)
28. The osmolal gap is defined as measured Osm/kg minus the calculated Osm/kg. The average osmolal gap is near...
conjugated hyperbilirubinemia - hepatocellular obstruction
chloride
albumin
0
29. A low concentrarion of serum phosphorus is commonly found in...
high carbohydrate diet for 3 days
there is an absence of correlation
sample exposed to light
carbohydrate hyperalimentation
30. Measurement of total T4 by competitive protein binding or displacement is based on the specific binding properties of...
T4 by RIA
thyroxine binding globulin
freezing point
HPLC analysis of porpobilinogen on 24hr urine
31. 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...
increased O2 decreased HCO3
HDL
incorrect aqueous to nonaqueous mixture
intestinal malabsorption
32. The enzyme present in almost all tissues that may be separated by electrophoresis into five components is...
LDH
Wilson's disease
TSH
chloride
33. A patient with glomerulonephritis would present the following serum results...
200x affinity for oxygen
increase in total circulating T4
BUN increased
high carbohydrate diet for 3 days
34. Serum from a patient with metastatic carcinoma of the prostate was separated from the clot and stored at room temperature. The following results were obtained: Patient Reference Range Calcium: 10.8 mg/dL 8.8-10.3 mg/dL LD:420 U/L 50-150 U/L Acid phos
LDH
accuracy
acute intermittent porphyria
ALP with fresh draw
35. Four children are admitted with malaise - anorexia - and abdominal pain. Further evaluations reveal mild anemia - erythrocyte basophilic stippling - and profound pica habits. Poisoning by which heavy metal is most likely responsible?
absorptivity x light path x concentration
sample exposed to light
lead
viral hepatitis
36. Most most likely to be ordered in addition to serum calcium to determine the cause of tetany?
monitoring the course of a known cancer
whole blood can be used
Mg
591
37. One means of checking a spectrophotometer wavelength calibration in the visible range is by using a...
HDL
thyroxine
alpha 2 beta
didymium filter
38. A condition in which erythrocyte protoporphyrin is increased is...
CO2
corticosterone
iron deficiency anemia
porphobilinigen SCREEN
39. The serum glucose concentration of a diabetic patient undergoing a 2-hour glucose tolerance test should return to the baseline (fasting level) after a minimum of...
run a new set of controls
alpha 2 beta
measures one ion more than others
120 minutes
40. The formula for calculating absorbance given the percent transmittance (%T) of a solution
2-log(T)
M subunit is inactivated
analyzed immediately
thyroxine binding globulin
41. A potentiometric electrode that measures an analyte that passes through a selectively premeable membrane and rapidly enters into an equilibrium with an electrolyte solution is...
pCO2
beta
LDL
GFR
42. The unit of measure for a standard solution is...
sodium potassium chloride CO2
mg/ml
2Na + glucose over 20 + BUN over 3
monitoring the course of a known cancer
43. The expected blood gas results for a patient in chronic renal failure would match the pattern of...
dirty electrodes
Temperature is a function of the number of particles in solution
metabolic acidosis
show a decrease in glycosylated hgb
44. 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...
normal - liver breakdown
carbs
GFR
without a disease with a negative test result
45. The following blood gas results were obtained: pH : 7.18 PO2: 86 mm Hg PCO2: 60 mm Hg O2 saturation: 92% HCO3-: 21 mEq/L TCO2: 23 mEq/L Base excess: -8.0 mEq/L The patient's results are compatible with...
(testing of urine for) delta-am.. acid
lower than in adults
emphysema
carbohydrate hyperalimentation
46. The selectivity of an ion-selective electrode is determined by the...
incorrect aqueous to nonaqueous mixture
properties of the membrane
placenta
340
47. A pH of 7.0 represents a H+ concentration of...
100nmol
trig
hyperventilation
creatine kinase
48. This method offers the greatest sensitivity for HBsAg testing
prisms and grating
MI
enzyme immunoassay
there is an absence of correlation
49. Serum haptoglobin...
atomic absorption
glucose tolerance test
can be separated into distinct phenotypes
hepatobiliary (obstruction?)
50. A true statement about high performance liquid chromatography (HPLC) is that it...
no ice clots bubbles
chloride
improving state of metabolic control (as indicated by fructosamine)
can be used for absorbtion - partition - ion exchange - and gel permeation chromatography