Forensic Science Module 11

Topics: Eye, Rifling, Firearm Pages: 2 (589 words) Published: October 1, 2013
Module Eleven: Lab Questions
Your first lab link can be found at Case One: Rookie Training. 1. What are the four basic steps of DNA processing?
a) The four basic steps of DNA processing are
a.1. Extract - Get the DNA out of the cell so we can work with it. a.2. Amplify – Increase the amount of DNA in our sample
a.3. Separate – Sort the DNA fragments by size
a.4. Analyze – Examine the different-sized fragments and construct a DNA profile. 2. From the toxicology lab, what is vitreous humor? Why do forensic scientists use it? a) The vitreous humor is the clear fluid inside the eye that gives the eye its shape. Toxicologists sometimes analyze vitreous humor to confirm results from the blood or urine. If a drug is present in any one of these fluids, it should be present in all three. The vitreous is collected with a syringe. 3. From the survey in the toxicology lab, would you be a good candidate to work in this area of forensic science? Why or why not? a) I don’t think that I would be a good candidate to work in the toxicology lab. I don’t think I would be able to handle working with maggots and stomach contents. I was also kind of scared when I saw the video of the person getting the vitreous fluid from the eye. 4. From the firearm analysis, what is a rifling number? How is it determined? a) A rifling number is the number of lands (raised areas) or grooves in a rifled barrel. The rifling number of a particular firearm can be determined by rotating the bullet and counting the number of rifling impressions present on the surface. 5. In the firearm case, what type of gun fired the bullet?

a) The caliber of the bullet is 9 millimeters. The bullet also has conventional rifling marks because the marks are rough and easy to see. The bullet itself has a rifling number of six. The two Taurus guns fit the category for which fired the bullet. It was the second Taurus that was the actual gun that fired the bullet. 6. What percentage of deaths in the medical examiner's...
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