Test your basic knowledge |

Chemistry Certification

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






2. Amniotic fluid submitted for a lecithin/sphingomyelin (US) ratio has been left in a brown container since the night before. You would expect...






3. A person suspected of having metabolic alkalosis would have these laboratory findings






4. On immunoassays using enzyme-labeled antibodies or antigens: ___________ can be carried out with a spectrophotometer






5. About 90% of phenytoin is excreted in the urine as...






6. The ability of a procedure to measure only the component(s) it claims to measure is called...






7. In the fasting state - the arterial and capillary blood glucose concentration varies from the venous glucose concentration by approximately how many mg/dL?






8. In the Jaffe reaction - creatine reacts with...






9. The test for adrenal cortical hyperfunction that has the greatest diagnostic sensitivity is measurement of...






10. A test request slip indicates that an acute porphyric attack is suspected clinically. Analysis should include...






11. One means of checking a spectrophotometer wavelength calibration in the visible range is by using a...






12. If the correlation coefficient (r) of two variables is zero...






13. The principle of the occult blood test depends on the...






14. Ion selective electrodes are called selective rather than specific because they actually measure the...






15. The selectivity of an ion-selective electrode is determined by the...






16. A patient with glomerulonephritis would present the following serum results...






17. Most drugs and intracellular metabolites measured by radioimmunoassay have molecular weights between 200 and 1000 and can be made immunogenic by...






18. To ensure an accurate ammonia level result - the specimen should be...






19. Currently the most common method for specific identification and quantitation of serum barbiturates is...






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...






21. Bromcresol purple at a pH of 5.2 is used in a colorimetric method to measure...






22. Unless blood gas measurements are made immediately after sampling - in vitro glycolysis of the blood causes a...






23. This condition does decrease activity of glucuronyl transferase result in increased unconjugated bilirubin and kernicterus in neonates






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...






25. Aminotransferase enzymes catalyze the...






26. Most most likely to be ordered in addition to serum calcium to determine the cause of tetany?






27. The osmolal gap is defined as measured Osm/kg minus the calculated Osm/kg. The average osmolal gap is near...






28. The Porter-Silber method (phenylhydrazine in alcohol and sulfuric acid) involves which part of the steroid molecule?






29. Sixty to seventy-five percent of the plasma cholesterol is transported by...






30. When taken by a euthyroid individual - oral contraceptives containing estrogens will have this effects on the thyroid function studies






31. In a normal individual - injection of thyrotropin-releasing hormone (TRH) causes an increase in blood concentrations of this hormone






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...






33. Most automated blood gas analyzers directly measure...






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...






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...






36. Before unconjugated bilirubin can react with Ehrlich's diazo reagent - this must be added






37. Hydrogen ion concentration (pH) in blood is usually determined by means of these electrodes?






38. In electrophoresis of serum proteins - arifacts at the application point are most frequently caused by...






39. Assay of transketolase activity in blood is used to detect deficiency of...






40. The osmolality of a urine or serum specimen is measured by a change in the...






41. A one MOLAL solution is equivalent to...






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...






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...






44. Clinical assays for tumor markers are the most important for...






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...






46. The relative migration rate of proteins on cellulose acetate is based on...






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...






48. An acid cleaning solution for glassware consists of...






49. The protein portion of an enzyme complex is called the...






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...