Questions & Answers
Browse all 25 questions from the
Advanced Forensic Biological Sciences study set below.
Each question shows the correct answer — select a study format above to practice interactively.
1
What is the specific temperature-dependent process occurring in the eyes that allows for the estimation of the post-mortem interval (PMI) via potassium concentration?
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A
Vitreous humor sequestration
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B
Corneal clouding
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C
Aqueous humor evaporation
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D
Retinal detachment
2
Which physiological process is responsible for the phenomenon of 'tache noire' in an unburied corpse?
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A
Bacterial putrefaction
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B
Dehydration of the sclera
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C
Hemolysis of ocular capillaries
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D
Post-mortem hypostasis
3
In forensic toxicology, what is the 'post-mortem redistribution' phenomenon primarily associated with?
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A
Drug movement from solid organs to the blood
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B
The evaporation of volatile poisons
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C
Rapid decomposition of bile
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D
The migration of skin cells into muscle
4
What is the primary cause of 'adipocere' formation in a decomposing body?
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A
Hydrolysis of subcutaneous adipose tissue
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B
Calcification of muscle fibers
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C
Denaturation of collagen proteins
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D
Oxidation of skin lipids
5
During rigor mortis, what specific chemical depletion at the cellular level prevents the detachment of actin-myosin filaments?
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A
Calcium ions
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B
Adenosine triphosphate (ATP)
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C
Lactic acid
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D
Creatine phosphate
6
Which phase of decomposition is characterized by the presence of 'marbling' caused by the reaction of hydrogen sulfide with hemoglobin?
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A
Bloat
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B
Active decay
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C
Advanced decay
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D
Putrefaction
7
What is the term for the pink staining of the inner walls of blood vessels that occurs post-mortem due to hemoglobin diffusion?
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A
Vascular engorgement
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B
Imbibition of staining
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C
Arterial spasm
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D
Heme-fixation
8
Which organ exhibits the highest rate of post-mortem autolysis due to its high concentration of digestive enzymes?
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A
Pancreas
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B
Liver
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C
Kidney
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D
Spleen
9
What is the clinical term for the mechanism where the blood pressure remains high at the moment of death, resulting in petechial hemorrhages?
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A
Asphyxial syndrome
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B
Tardieu spots
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C
Vagal inhibition
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D
Capillary rupture
10
In forensic odontology, what is the most reliable method for estimating age in adult remains?
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A
Gustafson's method
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B
Tooth eruption timing
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C
Dental caries index
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D
Enamel hypoplasia depth
11
What is the primary metabolite tested in hair to detect chronic heavy metal exposure in forensic investigations?
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A
Keratin sulfur complexes
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B
Chelated metallic ions
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C
Albumin-bound minerals
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D
Melanin-sequestered elements
12
What physiological change occurs in the skin immediately surrounding an electrical entry wound, often referred to as 'metallization'?
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A
Thermal coagulation
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B
Epidermal vapor explosion
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C
Metallic ion transfer from the conductor
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D
Carbonization of the dermis
13
Which skeletal feature is considered the most accurate for determining sex in an adult skeleton?
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A
Femur length
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B
Pelvis morphology
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C
Skull circumference
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D
Sternum density
14
What is the significance of the 'diatom test' in cases of suspected drowning?
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A
Detection of algae in bone marrow
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B
Identification of salt water in lungs
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C
Presence of plankton in the stomach
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D
Tracing riverbed silt in the pharynx
15
What substance is analyzed in the vitreous humor to differentiate between diabetic ketoacidosis and post-mortem ketosis?
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A
Glucose and beta-hydroxybutyrate
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B
Insulin and glucagon
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C
Glycogen and lactate
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D
Pyruvate and urea
16
What is the characteristic 'cherry-pink' lividity of a corpse indicative of?
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A
Carbon monoxide poisoning
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B
Cyanide toxicity
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C
Hypothermia
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D
High altitude edema
17
In forensic biology, what does the presence of 'spermine' in a stain confirm?
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A
The presence of semen
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B
The presence of saliva
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C
The presence of vaginal fluid
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D
The presence of sweat
18
What does the 'Kelvin-Helmholtz' instability phenomenon relate to in the context of forensic fluid dynamics?
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A
Blood spatter pattern geometry
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B
Gas bubble movement in tissues
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C
Decomposition fluid drainage
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D
Skeletal joint dislocation
19
Which type of cell is the first to arrive at a site of injury or trauma in a living person, and thus serves as a forensic indicator of vital reaction?
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A
Neutrophil
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B
Lymphocyte
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C
Eosinophil
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D
Monocyte
20
What occurs to the body's pH levels immediately following death as a result of anaerobic glycolysis?
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A
It increases to alkaline levels
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B
It decreases towards acidic levels
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C
It remains neutral
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D
It fluctuates rhythmically
21
Which specific bone is most frequently used to estimate stature in forensic anthropology?
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A
Femur
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B
Humerus
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C
Tibia
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D
Radius
22
What is the cause of 'scabbard trachea' often observed in cases of chronic upper airway compression?
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A
Lateral compression of the tracheal rings
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B
Ossification of the thyroid cartilage
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C
Fibrosis of the cricothyroid membrane
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D
Hypertrophy of the tracheal smooth muscle
23
What is the fundamental basis of the 'supra-vital' reaction test used to determine time of death in skeletal muscle?
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A
Response to electrical stimulation
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B
Reaction to chemical reagents
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C
Color change in muscle tissue
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D
Temperature decay rate
24
Which chemical compound is the primary byproduct responsible for the characteristic odor of decomposition?
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A
Putrescine
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B
Formaldehyde
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C
Ethane
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D
Acetone
25
What is the 'Haller's layer' in the context of forensic examination of the human eye?
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A
The vascular layer of the choroid
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B
The epithelial lining of the conjunctiva
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C
The nerve fiber layer of the retina
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D
The basement membrane of the cornea
