19 Which of the following is common in determining whether a

19. Which of the following is common in determining whether a substance is blood? a. Kastle-Meyer Test b. Gas chromatography c.Immunoassay d. Microdiffusion test 20. The study of insects and insect larvae on a body when approximating the time of an individual\'s death is referred to as a. forensic serology b. forensic anthology c. forensic entomology d. forensic arachnology 21. When a forensic toxicologist uses GC to separate two chemical compounds, which of the following statements is true? a. the molecules become separated based on their size b. the molecules become separated based on their attraction to the stationary phase c. the molecules become separated based on their level of toxicity d. the molecules separated based on whether they are a solid, a liquid, or a gas 22. This is a category of related techniques that aid in the identification of molecules (like drugs or poisons) based on how they interact with light. b. Chromatography c. Mass Spectrometry d. Colorimetric assay 23. The organization that sets rules for the collection and analysis of forensic evidence is: a. American Association of Forensic Study b. American Academy of Forensic Science c. Advancement of Forensic Scientists d. Association of American Forensic Scientists 24. A police officer finds a fragment of what is certainly human skull at an old, outdoor homicide scene. The bone is off-white in color. Of the following pairs of techniques, which would be most useful in helping investigators determine the identity of the victim in this situation? a. precipitin test, mitochrondrial DNA fingerprint b. fluorescence test, precipitin test c. blood typing, chromosomal DNA fingerprint d. fluorescence test, mitochondrial DNA fingerprint 25. Which of the following statements regarding metallic poisons (like mercury) is true? a. metals act as poisons because they are organic molecules b. metals are extremely toxic because they all dissolve readily in water (like our body) c. metals are easy to detect in human tissue by use of an immunoassay test d. metals cause bodily harm by displacing normal metals from cellular proteins and enzymes

Solution

19) option a. Kastle-Meyer test is the most inexpensive, easy and reliable forensic test to determine the presence of blood.

20) Option c. Forensic entomology is the scientific study of the anthropods (and their different stages of develpment) found on the decomposed cadavers during the legal investigations.

21) option b. Molecules will be passed through the stationary pahse which is usually Helium and their attraction towards the statinary phase seperate outs the different toxins present.

22) option a. Spectroscopy is the technique that helps in the identification of molecules based on how they react with light( examining the colors of light emitted by atoms, molecules)

Answering first four questions due to time constraints and policy guidelines.