CSI Forensic Analysis Techniques 2

Question 1

What technique uses antibodies to detect specific proteins or antigens in tissue samples?

Accepted Answer

Immunohistochemistry

Answer

Immunohistochemistry (IHC) uses labeled antibodies to detect and localize specific proteins within tissue sections.

Question 2

In forensic toxicology, what does 'postmortem redistribution' refer to?

Accepted Answer

Drug concentration changes in tissues after death

Answer

Postmortem redistribution describes how drug concentrations in tissues can change significantly after death, complicating toxicological interpretation.

Question 3

Which microscopy technique is most useful for examining the surface topography of bullet striations?

Accepted Answer

Scanning electron microscopy (SEM)

Answer

SEM provides high-resolution three-dimensional surface imaging ideal for examining fine details on bullets and tool marks.

Question 4

What is the purpose of using a 'blank' sample in forensic chemical analysis?

Accepted Answer

To detect contamination and establish baseline readings

Answer

A blank contains all reagents except the analyte, helping identify contamination and establish background signal levels.

Question 5

Which technique separates compounds based on their migration through a gel under an electric field?

Accepted Answer

Electrophoresis

Answer

Electrophoresis separates molecules, including DNA fragments and proteins, by size and charge as they move through a gel matrix.

(CSI) Crime Scene Investigator Practice Test

(CSI) Crime Scene Investigator Practice Test

CSI Forensic Analysis Techniques 2