BSFS Bachelor of Science in Forensic Science MCQ 4

Question 1

In forensic serology, the ABO blood type system is used because ABO antigens are present in:

Accepted Answer

Red blood cells and in secretions for approximately 80% of people

Answer

ABO antigens are found in red blood cells and, in approximately 80% of individuals (secretors), also in body fluids such as saliva and semen.

Question 2

What type of DNA marker is used in the CODIS database for criminal identification in the United States?

Accepted Answer

Short tandem repeats (STRs)

Answer

CODIS uses short tandem repeat (STR) profiles at 20 core loci for comparing DNA evidence to offender profiles in its database.

Question 3

In questioned document examination, what does 'line quality' refer to?

Accepted Answer

The smoothness, pen pressure, and continuity of strokes in handwriting

Answer

Line quality encompasses the smoothness, tremor, pen pressure, and continuity of strokes, which reveal whether writing was executed naturally or traced/forged.

Question 4

What is the main advantage of mitochondrial DNA (mtDNA) analysis over nuclear STR analysis in forensic cases?

Accepted Answer

mtDNA is present in higher copy numbers and persists in degraded samples

Answer

Mitochondrial DNA exists in hundreds to thousands of copies per cell, making it recoverable from highly degraded or old samples like hair shafts and ancient bones.

Question 5

Which reagent is used to detect latent fingerprints on porous surfaces such as paper?

Accepted Answer

Ninhydrin

Answer

Ninhydrin reacts with amino acids left by the skin in latent prints on porous surfaces, producing a purple-colored compound (Ruhemann's purple).

BSFS - Bachelor of Science in Forensic Science Practice Test

BSFS - Bachelor of Science in Forensic Science Practice Test

BSFS Bachelor of Science in Forensic Science MCQ 4