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CJ 210 Exam 3 Questions And Accurate Answers
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CJ 210 Exam 3 Questions And Accurate AnswersWhy is forensic serology no longer a commonly recognized discipline - Answer due to
the advent of DNA typing methods. Deoxyribonucleic acid analysts, and trace evidence
analysts perform the tests)
Define serology - Answer the examinations and analysis of body fluids and among those
fluids blood
A typical adult has how much blood in their body - Answer 4.5 - 6.5 liters AKA 1-2 gallons
What do WBC's do - Answer transport oxygen and bicarbonate; lose nucleus before
entering the circulatory system
Function of Platelets - Answer function in blood clotting formation
What does DNA target - Answer cells with a nucleus so you need WBC or cells with a
nucleus
Catalytic color test - Answer Presumptive test.
Employ the chemical oxidation of a chromogenic substance by an oxidizing agent
catalyzed by the presence of blood (Really the hemoglobin)
Name some Presumptive tests for blood. - Answer -Catalytic color test.
-Fluorescein and Luminol
-Benzidine (Adler test)
-Tetramethylbenzidine and Hemastix
-Phenolphthalein (Kastle-meyer) test
, -Chemiluminescence
Define chemiluminescence - Answer the process by which light is emitted as a product
of a chemical reaction. (No artificial light needed)
At what point does fluorescence occur? - Answer When a chemical substance is
exposed to a particular wavelength of light-usually short-and longer wavelengths emit
light energy
Confirmation tests for blood - Name -Teichmann test
-Takayama test
Briefly describe the process of the Teichmann test: heating of dried blood in the
presence of glacial acetic acid and a halide form the hematin derivation. Under a
microscope they are brown and rhombic shape
Briefly describe the process of the Takayama test: heme is gently heated with pyridine
under alkaline conditions in the presence of a reducing sugar such as glucose
why do we use presumptive tests? -Answer they are easy, quick, can do them on site
and low detection limits (very sensitive)
How do we ID that a substance is blood - Answer Id of the protein hemoglobin in red
blood cells
- Sometimes other proteins specific to blood
In the chemical reaction for Presumptive tests what happens -Answer Based on blood's
peroxidase activity
(O) then reacts with a chemical to produce a color or give off light
What are some sources of false positives - Answer -Certain metals (corroded copper or
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