PLTW BIOMEDICAL SCIENCE NEW REVISED EXAM
2025/2026 Q&A
forensic scientist - investigates crimes by collecting and analysing physical evidence
Search Methods - Evidence may be located using a systematic approach to survey the site. These
methods employ spiral, grid, line, or zone techniques.
Point of Origin - The point of origin is the point where they take all measurements from within the
scene perimeter.
Key - The key indicates important objects that are marked with a specific number/shape. In this case,
the keys were the evidence markers.
Legend - A list that identifies patterns, symbols, or colours used in a chart
Scale - Specify a percentage of original size to enlarge or reduce the size of an object.
Person of Interest - A person being questioned in connection to the crime.
Physiological Response - the pattern of chemical and electrical activity that occurs in sense organs,
nerves, and the brain, because of the stimulus.
Stimulus - a signal to which an organism responds
Polygraph - a machine that writes down many different changes in the body while the person
answers questions, a lie detector test
Heart Rate - The number of times the heart beats per minute
vital signs - A group of the six crucial medical signs that indicate the status of the body's vital
functions.
, Pulse - The rhythmic expansion and recoil of arteries resulting from heart contraction; can be felt
from the outside of the body.
Respiratory Rate - The rate of which breathing occurs
blood pressure - the pressure that is exerted by the blood against the walls of blood vessels
Skin Conductivity - How the amount of sweat produced impacts the ability to conduct electricity
Control Group - In an experiment, the group that is not exposed to the treatment; contrasts with the
experimental group and serves as a comparison for evaluating the effect of the treatment.
experimental group - In an experiment, the group that is exposed to the treatment, that is, to one
version of the independent variable.
independent variable - The experimental factor that is manipulated; the variable whose effect is
being studied.
Hypothesis - A testable prediction, often implied by a theory
dependent variable - The outcome factor; the variable that may change in response to manipulations
of the independent variable.
Lockard’s Exchange Principle -
trace evidence - small but measurable amounts of physical or biological material found at a crime
scene
Cuticle (Hair) - outermost layer, consists of a single layer of thin, flat cells that are the most heavily
keratinized
Cortex (Hair) - the middle layer, used for strength and also is the layer that holds color
2025/2026 Q&A
forensic scientist - investigates crimes by collecting and analysing physical evidence
Search Methods - Evidence may be located using a systematic approach to survey the site. These
methods employ spiral, grid, line, or zone techniques.
Point of Origin - The point of origin is the point where they take all measurements from within the
scene perimeter.
Key - The key indicates important objects that are marked with a specific number/shape. In this case,
the keys were the evidence markers.
Legend - A list that identifies patterns, symbols, or colours used in a chart
Scale - Specify a percentage of original size to enlarge or reduce the size of an object.
Person of Interest - A person being questioned in connection to the crime.
Physiological Response - the pattern of chemical and electrical activity that occurs in sense organs,
nerves, and the brain, because of the stimulus.
Stimulus - a signal to which an organism responds
Polygraph - a machine that writes down many different changes in the body while the person
answers questions, a lie detector test
Heart Rate - The number of times the heart beats per minute
vital signs - A group of the six crucial medical signs that indicate the status of the body's vital
functions.
, Pulse - The rhythmic expansion and recoil of arteries resulting from heart contraction; can be felt
from the outside of the body.
Respiratory Rate - The rate of which breathing occurs
blood pressure - the pressure that is exerted by the blood against the walls of blood vessels
Skin Conductivity - How the amount of sweat produced impacts the ability to conduct electricity
Control Group - In an experiment, the group that is not exposed to the treatment; contrasts with the
experimental group and serves as a comparison for evaluating the effect of the treatment.
experimental group - In an experiment, the group that is exposed to the treatment, that is, to one
version of the independent variable.
independent variable - The experimental factor that is manipulated; the variable whose effect is
being studied.
Hypothesis - A testable prediction, often implied by a theory
dependent variable - The outcome factor; the variable that may change in response to manipulations
of the independent variable.
Lockard’s Exchange Principle -
trace evidence - small but measurable amounts of physical or biological material found at a crime
scene
Cuticle (Hair) - outermost layer, consists of a single layer of thin, flat cells that are the most heavily
keratinized
Cortex (Hair) - the middle layer, used for strength and also is the layer that holds color
