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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 true statement about high performance liquid chromatography (HPLC) is that it...
pH pCO2 pO2
can be used for absorbtion - partition - ion exchange - and gel permeation chromatography
dihydroxyacetone side chain
placenta
2. Aminotransferase enzymes catalyze the...
cysteine
100nmol
exchange of amino and keto groups
specimen exposure to light
3. Gas chromatography with the nitrogen/phosphorus detector is the most commonly used technique for the analysis of...
cyclic antidepressants
freezing point
@ 100
serum aliquots - one heated
4. The enzyme that exists chiefly in skeletal muscle - heart - and brain; is grossly elevated in active muscular dystrophy; and rises early in myocardial infarction is...
thiamine
occult blood
creatine kinase
have a negative charge
5. The test for adrenal cortical hyperfunction that has the greatest diagnostic sensitivity is measurement of...
urinary free cortisol
growth - third trimester of pregnancy
bicarbonate carbonic acid
endogenous triglycerides
6. Patients with Cushing's syndrome exhibit...
ionization of carboxyl groups (yielding a net negative charge)
viral hepatitis
sharp fibrinogen peak
serum cortisol > 15
7. Quantitation of NA+ and K+ by ion-selective electrode is more rapid than flame photometry because...
whole blood can be used
conjugated hyperbilirubinemia - hepatocellular obstruction
GGT
F
8. Creatinine clearance is used to estimate the...
no ice clots bubbles
3500
GFR
sharp cutoff filter
9. Upon completion of a run of cholesterol tests - the technician recognizes that the controls are not within the two standard deviations confidence range. What is the appropriate course of action?
amytriptyline 104
run a new set of controls
O2
3500
10. Spectrophotometers isolate a narrow band pass by means of...
serum aliquots - one heated
prisms and grating
Calcium - phosphorus
NADH
11. The chemical composition of HDL- cholesterol corresponds to...
F
patient noncompliance
5 tri 15 cholesterol 50 protein
nephelometry
12. A common cause of a falsely increased LD1 fraction of lactic dehydrogenase is...
correct for variations in flame and atomizer
hemolysis
CO2 and pH elevated
65
13. 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...
conjugated hyperbilirubinemia - hepatocellular obstruction
occult blood
atomic absorption
have a negative charge
14. 4 mL of water is added to 1 mL of serum. This represents this serum dilutions
remove excess unbound iron
1:5
volumetric flask
can be separated into distinct phenotypes
15. Serum haptoglobin...
the same as plasma glucose
attaching them to protein molecules
128
can be separated into distinct phenotypes
16. 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
manic-depression
100 nmol
tissue and serum levels need to reach equilibrium
17. This enzymes catalyzes the conversion of starch to glucose and maltose
amylase
peroxidase-like activity of hemoglobin
endogenous triglycerides
metabolic acidosis
18. Most drugs and intracellular metabolites measured by radioimmunoassay have molecular weights between 200 and 1000 and can be made immunogenic by...
chloride
GGT
testosterone
attaching them to protein molecules
19. Zinc protoporphyrin or free erythrocyte protoporphyrin measurements are useful to assess blood concentrations of...
pH = pKa + log (salt/acid)
lead
ammonia
there is an absence of correlation
20. The principle of the occult blood test depends on the...
peroxidase-like activity of hemoglobin
0
increased vasoconstriction
65
21. 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
(testing of urine for) delta-am.. acid
ALP with fresh draw
fresh morning urine for delta-aminolevulinic acid
remove excess unbound iron
22. The method of choice for diagnosis of a protracted attack of porphyria is...
one micromole/minute
SD over mean
HPLC analysis of porpobilinogen on 24hr urine
cyclic antidepressants
23. After a difficult venipuncture requiring prolonged application of the tourniquet - the serum K+ was found to be 6.8 mEq/L. The best course of action is to...
lactic acidosis
lower than in adults
cancel test
chloride
24. Ion selective electrodes are called selective rather than specific because they actually measure the...
testing heparinized plasma
beta
measures one ion more than others
conjugated hyperbilirubinemia - hepatocellular obstruction
25. The formula for calculating absorbance given the percent transmittance (%T) of a solution
the fetus is at risk for respiratory distress
run a new set of controls
M subunit is inactivated
2-log(T)
26. In spectrophotometric determination - this is the formula for calculating the absorbance of a solution
corticosterone
absorptivity x light path x concentration
fetal and placenta function
parathyroid
27. The protein portion of an enzyme complex is called the...
urobilin
triglycerides
sodium potassium chloride CO2
apoenzyme
28. This serum constituent is unstable if a blood specimen is left standing at room temperature for 8 hours before processing
C3 complement
digoxin
pH = pKa + log (salt/acid)
glucose
29. The TRH (thyrotropin-releasing hormone) stimulation test is useful in assessing...
Temperature is a function of the number of particles in solution
freezing point
hyperthyroidism
can be used for absorbtion - partition - ion exchange - and gel permeation chromatography
30. Gel filtration chromatography is used to separate...
cmpds based on molecular weight and size
pH pCO2 pO2
be able to detect 9/10 simple instrument malfunctions
Temperature is a function of the number of particles in solution
31. Nephelometers measure light...
conjugated hyperbilirubinemia - hepatocellular obstruction
prisms and grating
scattered at a right angle
growth - third trimester of pregnancy
32. The following data were obtained from a cellulose acetate protein electrophoresis scan: Albumin area 75 units Gamma globulin area 30 units Total area 180 units Total protein 6.5 g/dL The gamma globulin content in g/dL is...
is quantitated by the amount of light produced
show a decrease in glycosylated hgb
wavelength
1.1
33. Cerebrospinal fluid for glucose assay should be...
analyzed immediately
200x affinity for oxygen
thyroxine
chylomicrons VLDL
34. Serum and urine copper levels are assayed on a hospital patient with the following results: Patient Serum Cu: 58 ug/dL; Reference Value:70-140 ug/dL Patient Urine Cu: 83 ug/dL ; Reference Value: < 40 ug/dL This is most consistent with...
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on line
183
35. The osmolality of a urine or serum specimen is measured by a change in the...
2-log(T)
0
freezing point
GLC
36. A stool specimen that appears black and tarry should be tested for the presence of...
valine leucine isoleucine
O2
CO2 and pH elevated
occult blood
37. 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?
MI
thiamine
TSH
without a disease with a negative test result
38. The Henderson-Hasselbalch equation
pituitary
O2
pH = pKa + log (salt/acid)
high carbohydrate diet for 3 days
39. The following results were obtained in a creatinine clearance evaluation: Urine concentration 84 mg/dL Urine volume 1440 mL/24 hr Serum concentration 1.4 mg/dL Body surface area 1.60 m2 (average = 1.73 m2) The creatinine cle~trance in mL/min is...
glass
g/MW
65
fall in pH - rise in pCO2
40. Beriberi is associated with deficiency of...
properties of the membrane
thiamine
90%
multiplied by 4
41. This would be an example of a glucose-specific colorimetric method
Mg
there is an absence of correlation
thiamine
glucose oxidase
42. Testing for the diagnosis of lead poisoning should include...
lower than in adults
(testing of urine for) delta-am.. acid
inclusion of smokers and nonsmokers in the study population
2Na + glucose over 20 + BUN over 3
43. The normal concentration of proteins in cerebrospinal fluid - relative to serum protein - is...
<1%
triglycerides
intestinal malabsorption
occult blood
44. 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...
can be separated into distinct phenotypes
Tangier
pO2 increased HCO3 decreased
check serum for hemolysis
45. Given the following results: Alkaline phosphatase Marked increase Aminotransferase Slight increase Aspartate aminotransferase Slight increase Alanine gamma-glutamyl transferase Marked increase This is most consistent with...
measure the total volume
is quantitated by the amount of light produced
obstructive jaundice
amylase
46. In performing a spinal fluid protein determination - the specimen is diluted 1 part spinal fluid to 3 parts saline to obtain a result low enough to measure. To calculate the protein concentration the result must be...
agarose
scattered at a right angle
multiplied by 4
peroxidase-like activity of hemoglobin
47. This wavelengths is within the ultraviolet rang.
100 nmol
GLC
porphyrin and porphobilinogen screen
340
48. In a normal individual - injection of thyrotropin-releasing hormone (TRH) causes an increase in blood concentrations of this hormone
LDL
respiratory acidosis
BUN 80
Prolactin
49. This hemoglobin has glucose-6-phosphate on the amino-terminal valine of the beta chain?
dirty applicators
glucose tolerance test
A1c
<45
50. The measurement of light scattered by particles in the sample is the principle of...
CK-MB
340
nephelometry
glycerol