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Forensic Chemistry and Toxicology  Review Questions 1

(Answers are provided below)


1. A substance yields a deep purple color with the Marquis reagent and a bright blue color with Simon’s reagent. Which substance is most likely present?

A. Heroin

B. Methamphetamine Hydrochloride (Shabu)

C. Cocaine

D. Marijuana


2. A victim's blood and internal organs exhibit a bright, cherry-red discoloration. This is a classic sign of lethal poisoning by which substance?

A. Cyanide

B. Arsenic

C. Carbon Monoxide

D. Mercury


3. Which non-destructive analytical instrument is best suited to determine the chemical composition, organic binders, and pigments of a microscopic paint flake?

A. Gas Chromatography-Mass Spectrometry (GC-MS)

B. Fourier Transform Infrared Spectroscopy (FTIR)

C. Atomic Absorption Spectroscopy (AAS)

D. Ultraviolet-Visible (UV-Vis) Spectroscopy


4. Which presumptive color test for blood uses a solution of phenolphthalein and hydrogen peroxide to produce a deep pink color?

A. Kastle-Meyer Test

B. Takayama Test

C. Teichmann Test

D. Benzidine Test


5. Alcohol is metabolized by the human body at a constant rate that is independent of its concentration in the blood. This metabolic process follows:

A. First-order kinetics

B. Zero-order kinetics

C. Michaelis-Menten clearance

D. Oxidative phosphorylation


6. Which chemical test reacts with the iron in hemoglobin to cause trace, invisible bloodstains to luminesce blue in the dark?

A. Precipitin test

B. Kastle-Meyer Test

C. Luminol Test

D. Hemastix Test


7. Which test uses rabbit antiserum to produce a visible precipitation line to determine if a blood sample is of human or animal origin?

A. Precipitin test

B. Kastle-Meyer Test

C. Luminol Test

D. Hemastix Test


8. Which rapid, field-ready presumptive test uses a plastic strip with a reagent pad that turns from yellow to green/blue in the presence of blood?

A. Precipitin test

B. Kastle-Meyer Test

C. Luminol Test

D. Hemastix Test


9. Which diagnostic screening test involves rubbing a stain with a swab, adding reduced phenolphthalein and hydrogen peroxide, and watching for an immediate deep pink color?

A. Precipitin test

B. Kastle-Meyer Test

C. Luminol Test

D. Hemastix test


10. Among the options below, which one is a specific confirmatory or species identification test rather than a presumptive test?

A. Precipitin test

B. Kastle-Meyer Test

C. Luminol Test

D. Hemastix test


Questioned Documents Examination Reviewer


Answer:

1. B

2. C

3. B

4. A

5. B

6. C

7. A

8. D

9. B

10. A