Example Midterm Questions:
Example Midterm Questions:
What does the headspace analysis measure in blood alcohol testing?
Alchohol Volatility
What is the approximate ratio of alcohol in urine to that in blood?
1:1.3, 1 mL of alcohol in urine is equivalent to 1.3 mL of blood.
Which enzyme primarily metabolizes ethanol in the liver?
Alcohol dehydrogenase (ADH) is the primary enzyme involved in the metabolism of ethanol.
What percentage of ethanol is metabolized in the liver?
At least 90% of ethanol metabolism occurs in the liver.
A phlebotomist has taken a blood sample from a suspect who was arrested for driving under the influence of alcohol. What two chemicals must be added immediately to the blood sample?
Anticoagulant and preservative
Which of the following is an indirect measurement of %BAC?
Breath and urine
What is the purpose of the column in a gas chromatograph?
To separate the sample mixture and deliver them to the detector.
Which of the following best describe the Metabolism phase of alcohol?
Alcohol is transformed by enzymes to be easily excreted from the body.
Which of the following is an example of a patent print?
A bloody fingerprint on the wall of a crime scene (visible to the naked eye).
Level 1 of Fingerprint identification is useful for:
Excluding of a person as a fingerprint donor.
Individual characteristics on a bullet can be measured by ______.
Comparing the consecutive matching striae
Individual characteristics are marks produced by random imperfections
_____ impression would not be found on a bullet.
Ejector
A bullet from a crime scene was compared to a known bullet (One that was test fired in a crime lab). The known bullet originated from a firearm that was recovered from a suspect. Using microscopic analysis, the firearms analyst noted there is significant disagreement in class and individual characteristics between the two bullets. As a firearms analyst, how would you classify this comparison?
Elimination
How are class characteristics (alone) important in Firearms analysis?
It can conclude that the bullet could have been fired from the suspect’s firearm.
A breech face impression from a fired revolver will be present on the _____
Bullet, cartridge, barrel
How is Enzyme Immunoassay used in Forensic Toxicology?
The antibody recognizes the drug class and produces a color change.
What instrument is typically used to for sample preparation (“clean-up”) for Toxicological Examination?
Solid Phase Extraction
Which of the following is not true about TCDD?
The LD50 is the same across species.
LD50 is ______.
The dose that causes 50% of organisms to die.
What was NOT an impact of the Daubert and Kumho cases?
The Frye standard was strengthened
Which was NOT a trace evidence recovered from the scene?
Gunshot residues
Which of the following are NOT drinking alcohols?
2-propanol
Which physicochemical characteristic of alcohol allows headspace analysis via GC-MS?
Volatility and polarity
What is the toxic intermediate of alcohol metabolism that is implicated in the effects of a “hangover”?
Acetaldehyde
What does the term ‘retrograde extrapolation’ refer to in alcohol analysis?
Estimating BAC from a known level at a specific time
What factor is crucial for alcohol absorption in the gastrointestinal tract?
Surface area
*in headspace analysis they are testing for alcohol volitility