Chem 40005 - Clinical Chemistry » Summer 2021 » Module 2 Quiz

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Question #1
A commonly used electrode also used as an internal reference electrode in ion-selective electrode measurements is which one of the following?
A.   Gas permeable
B.   Mercury vapor
C.   Platinum
D.   Silver/silver chloride
Question #2
The light source in an atomic absorption spectrophotometer is typically a
A.   prism.
B.   laser light.
C.   hollow cathode tube.
D.   tungsten light.
Question #3
Incorporation of _____, a neutral antibiotic, into a polyvinyl chloride membrane allows for the manufacture of an ion-selective electrode that is highly selective for potassium.
A.   nonactin
B.   valinomycin
C.   erythromycin
D.   tetracycline
Question #4
What is the importance of the ionic strength of the buffer used in gel electrophoresis?
A.   No migration will occur if a buffer’s ionic strength is too high.
B.   Staining of the protein fractions will not occur if the ionic strength in the buffer is too high.
C.   A heat-labile protein will become denatured if the ionic strength of the buffer is too high.
D.   Increased ionic strength will lead to a backward electrophoretic pattern.
Question #5
What stains are used to stain a serum protein electrophoresis gel?
A.   Coomassie Blue and ethidium bromide
B.   Crystal Violet and Sudan Black
C.   Amido Black and Coomassie Brilliant Blue
D.   Oil Red O and Amido Black
Question #6
Which two optical techniques are combined operationally in a flow cytometer?
A.   Fluorescence polarization and laser-induced fluorometry
B.   Spectrophotometry and fluorescence polarization techniques
C.   Laser-induced fluorometry and light scattering techniques
D.   Atomic absorption spectrophotometry and light scattering techniques
Question #7
A separation technique that can detect proteins in a complex mixture with the use of antibodies directed against a protein of interest is
A.   capillary electrophoresis.
B.   electrokinetic chromatography.
C.   Western blotting.
D.   Northern blotting.
Question #8
An electrochemical technique used to measure chloride in serum or plasma is
A.   voltammetry.
B.   coulometry.
C.   conductometry.
D.   amperometry.
Question #9
When selecting a photometric technique that is more sensitive to a low concentration of analyte, a laboratory director compares absorbance measuring devices against those that measure fluorescence intensity. Which technique is considered more sensitive in its measurements and why?
A.   Absorbance measurements are more sensitive because the flame can break down complex compounds into elements that are specifically measured.
B.   Absorbance measurements are more sensitive because of the ability of the monochromator to isolate very specific parts of the spectrum.
C.   Fluorescence intensity measurements are more sensitive because the fluorophores used are very specific to the analytes they bind to and will bind to small analytes easily.
D.   Fluorescence intensity measurements are more sensitive because of the use of intense light sources, signal filtering, and sensitive light emission photometers.
Question #10
In capillary electrophoresis, hydrodynamic sample injection
A.   is best for analytes that have a higher electrophoretic mobility.
B.   is sometimes considered to be a “biased” type of sample injection.
C.   involves sample injection into the capillary by applying a voltage.
D.   involves sample injection into the capillary by applying a positive pressure to the sample inlet.
Question #11
The isoelectric point (pI) of a protein is the pH at which the protein
A.   has no net charge.
B.   migrates best in electrophoresis.
C.   has a negative charge.
D.   has a positive charge.
Question #12
A biosensor that uses both enzyme detection and an ion-specific electrode could be examining
A.   cholesterol using cholesterol oxidase with production of fluorescent cations.
B.   bilirubin using bilirubin oxidase and the production of hydrogen ions.
C.   urea using urease and the production of ammonium ions.
D.   glucose using glucose oxidase and the production of biocarbonate ions.
Question #13
Measurement of pH involves which kind of electrode?
A.   Hydrogen ion-selective electrode
B.   Hydrogen redox electrode
C.   Gas permeable PCO2 electrode
D.   Voltammetric hydrogen electrode
Question #14
Upon receiving a serum sample for protein electrophoresis, which you perform using agarose gel, you note that the specimen is hemolyzed. How would hemolysis affect the banding pattern of this type of electrophoresis?
A.   There would be an increased β-globulin band.
B.   There would be no effect on any of the protein bands.
C.   There would be an increase in the γ-globulin bands.
D.   There would be an increased α1-globulin band.
Question #15
Which one of the following optical techniques is not considered an emission technique?
A.   Fluorometry
B.   Nephelometry
C.   Luminometry
D.   Phosphorimetry
Question #16
The main advantage of capillary electrophoresis over standard gel electrophoresis is
A.   more efficient heat dissipation for better separation.
B.   the increased amount of time required for separation.
C.   the small sample size required.
D.   the ability to use a variety of buffers in the system.
Question #17
Potentiometric measurements are based on galvanic electrochemical cells. These types of cells consist of
A.   a polarizable working electrode to which an external voltage is applied with the resulting cathodic or anodic current of the cell being monitored.
B.   a biologic recognition element and a physicochemical transducer, often an electrochemical or optical device.
C.   two inert metal electrodes to which an electrical potential is applied.
D.   two electron or metallic conducting electrodes that are connected by an electrolyte solution that conducts ions.
Question #18
A molecule is said to fluoresce when it absorbs light at one wavelength and emits light of
A.   the same wavelength.
B.   a higher energy.
C.   a shorter wavelength.
D.   a lower energy.
Question #19
A physician is concerned about an emphysema patient’s PO2 level and wants to determine it in this patient’s blood. Which one of the following would be best used to determine PO2?
A.   Coulometric method
B.   Ion-selective electrode
C.   Amperometric method
D.   Conductivity-based measurement
Question #20
What would the concentration of albumin be if the total protein value was 8.5 g/dL and the densitometer measured the albumin fraction as 55% of the total?
A.   0.065 g/dL
B.   4.68 g/dL
C.   Albumin values cannot be calculated using densitometry.
D.   15.4 g/dL

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