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Chemistry Certification

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
ceruplasmin
ratio of distance moved by solvent to distance moved by compound
testing heparinized plasma
2-log(T)

2. Fluctuation of the needle on a coulometric type titrator is most probably due to...
dirty electrodes
@ 100
bone
atomic absorption

3. The concentration of serum carotene is affected MOST by...
standard
porphobilinogen synthetase
diet
without a disease with a negative test result

4. 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
run a new set of controls
standard
chylomicrons VLDL
can be separated into distinct phenotypes

5. The definitive diagnosis of primary adrenal insufficiency requires demonstration of...
sharp fibrinogen peak
impaired response to ACTH stimulation
A1c
chloride

6. In amniotic fluid - the procedure used to detect Rh isosensitization is...
the same as plasma glucose
measurement of absorbance at 450
pilocarpine
can be used for absorbtion - partition - ion exchange - and gel permeation chromatography

7. The most heat labile fraction of alkaline phosphatase is obtained from...
methyl alcohol
increased vasoconstriction
bone
BUN increased

8. 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...
chemical ionization matrix
A1
freezing point
normal - liver breakdown

9. Certain enzymes are activated to metabolize drugs as a result of another drug action. This is referred to as...
enzyme induction
faster than gamma
measures one ion more than others
nondiagnostic for MS

10. This method employs a highly specific antibody to thyroxine
T4 by RIA
prevent phosphate interference
0
TLC

11. A breakdown product of hemoglobin is...
without a disease with a negative test result
WITHOUT a disease with a negative test
heparin
bilirubin

12. Quantitation of NA+ and K+ by ion-selective electrode is more rapid than flame photometry because...
prisms and grating
band width
glucose tolerance test
whole blood can be used

13. A course of instruction is being planned to teach laboratory employees to correct simple malfunctions in selected laboratory instruments. In writing the objectives for this course - this would be most appropriate?
be able to detect 9/10 simple instrument malfunctions
pH = pKa + log (salt/acid)
crigler
SD over mean

14. The relative migration rate of proteins on cellulose acetate is based on...
ionic charge
purulent
serum aliquots - one heated
cyclic antidepressants

15. Lasting serum phosphate concentration is controlled primarily by the...
100nmol
bilirubin
270
parathyroid

16. Blood was collected in a serum separator tube from a patient who had been fasting since midnight. The time of collection was 7:00 AM. The laboratory test that should be re-collected is...
peroxidase-like activity of hemoglobin
chylomicrons
corticosterone
triglycerides

17. The most common type of congenital adrenal hyperplasia associated with increased plasma concentrations of 17 a-hydroxyprogesterone and increased urinary excretion of pregnanetriol is...
plasma bicarbonate
21-hydroxylase deficiency
2-log(T)
bilirubin

18. Assay of transketolase activity in blood is used to detect deficiency of...
glucose oxidase
acute intermittent porphyria
thiamine
can be separated into distinct phenotypes

19. Estrogen and progesterone receptor assays are useful in assessing prognosis in...?
C
breast cancer
C3 complement
respiratory acidosis

20. One means of checking a spectrophotometer wavelength calibration in the visible range is by using a...
didymium filter
hemolysis
A1
120 minutes

21. The most specific enzyme test for acute pancreatitis is...
HCT
parathyroid hormone
lipase
corticosterone

22. This is a glycolytic enzyme that catalyzes the cleavage of fructose-1 - 6-diphosphate to glyceraldehyde-3-phosphate and dihydroxyacetone phosphate
cholesterol normal triglycerides elevated
sharp cutoff filter
aldolase
lower than in adults

23. While performing a serum lithium determination on a flame photometer with cesium as the internal standard - the technologist noticed that there was a flickering flame. The most probable cause of this problem is...
changes in the fuel
can be separated into distinct phenotypes
cyclic antidepressants
measures one ion more than others

24. What specimen preparation is commonly used to perform the alkaline phosphatase isoenzyme determination?
serum aliquots - one heated
Calcium - phosphorus
pilocarpine
0

25. The protein portion of an enzyme complex is called the...
apoenzyme
4.5
LDH
pilocarpine

26. The biuret reaction for the analysis of serum protein depends on the number...
amylase
GLC
peptide bonds
(testing of urine for) delta-am.. acid

27. In competitive inhibition of an enzyme reaction the...
g/MW
C3 complement
inhibitor binds to enzyme at same site as substrate
methadone

28. Clinical assays for tumor markers are the most important for...
correct for variations in light intensity
dihydroxyacetone side chain
TSH
monitoring the course of a known cancer

29. A serum potassium is 19.5 mg/100 mL. This value is equal to how many mEq/L (MW of K = 39)?
65
5
HDL
F

30. The principle of the occult blood test depends on the...
occult blood
decreased lecithin
check serum for hemolysis
peroxidase-like activity of hemoglobin

31. The formula for calculating serum osmolality that incorporates a correction for the water content of plasma is...
impaired response to ACTH stimulation
lipase
parathyroid
2Na + glucose over 20 + BUN over 3

32. Aminotransferase enzymes catalyze the...
catalyze redox reactions
TSH
exchange of amino and keto groups
fetal and placenta function

33. 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...
g/MW
breast cancer
pO2 increased HCO3 decreased
TSH

34. The most consistent analytical error involved in the routine determination of HDLcholesterol is caused by...
a small concentration of APO-B containing lipoproteins after precipitation
thiamine
volumetric flask
porphobilinigen SCREEN

35. The chemical composition of HDL- cholesterol corresponds to...
the same as plasma glucose
1.9
F
5 tri 15 cholesterol 50 protein

36. Amino acid associated with a sulfhydryl group
cysteine
<45
measurement of absorbance at 450
Temperature is a function of the number of particles in solution

37. In the fasting state - the arterial and capillary blood glucose concentration varies from the venous glucose concentration by approximately how many mg/dL?
respiratory acidosis
2-log(T)
primidone
5mg higher

38. The regulation of calcium and phosphorus metabolism is accomplished by which gland?
T4 by RIA
parathyroid
sharp cutoff filter
iron deficiency anemia

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...
amylase
primidone
sample exposed to light
120 minutes

40. 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...
faster than gamma
Prolactin
aldolase
purulent

41. 4 mL of water is added to 1 mL of serum. This represents this serum dilutions
prostate
thyroxine
1:5
glucose oxidase

42. A patient with malabsorption receives 25 g of d-xylose orally; during the subsequent 5-hour period - the urine excretion of d-xylose is less than 3 g. This would indicate...
TSH
cysteine
intestinal malabsorption
ceruplasmin

43. A one MOLAL solution is equivalent to...
ALP with fresh draw
freezing point
1 mol/kg
sodium

44. The presence of this isoenzymes indicates acute myocardial damage
120 minutes
CK-MB
is quantitated by the amount of light produced
standard

45. In the atomic absorption method for calcium - lanthanum is used...
alkaline picrate
prevent phosphate interference
effluent line is obstructed
serum aliquots - one heated

46. 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
elevated lactic acid - elevated pyruvate
respiratory ACIDOSIS
Wilson's disease
pilocarpine

47. The buffering capacity of blood is maintained by a reversible exchange process between bicarbonate and...
chloride
creatinine
measure the total volume
whole blood can be used

48. What substance gives feces its normal color?
quantitation of label
LDL
specificity
urobilin

49. 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...
para-hydroxylphenyl...
measures one ion more than others
chloride
creatine kinase

50. A blood creatinine value of 5.0 mg/dL is most likely to be found with this blood value?
9
BUN 80
prevent phosphate interference
hyperventilation