PLTW PBS MIDTERM EXAM
QUESTIONS AND ANSWERS 2026
VERIFIED.
Microscope levels - ANS 4x scanning, 10x, low, 40x, high
objective lenses
parts of microscope - ANS objective lessons, fine focus knob, course focus, stage clips,
diaphragm, base, stage, arm, eyepiece, body tube, light source
types of fingerprint - ANS loop - like the swirl
arch - like a bump
tentarch - steeper arch, from both sides
doubleloop - exactly what it sound like, my thumb
pocket loop - loop with bulleye in center
whorl - bullseye
mixed - weird no catagory
Blood indicator - ANS if it clots up, then the blood is the blood of the indicator
crime scene methods - ANS link method - association with evidance
line/strip method - proceed along straight lines, large outdoor crime scenes.
grid - same but both ways
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, zone - split into zones, methods in each zone
spiral - in or out to in, large, no physical barriers
wheel ray - small circular crime scenes
how do scientists design experiments to find the most accurate answer to the question? -
ANS design experiment around question
scientific method and applicable variables
How are bloodstain patterns left at a crime scene used to help find out what happened during a
crime? - ANS the way a blood spatter splatters can tell about how they were hit, violent or
non-violent.
Types of signs after death - ANS rigor mortis - stiffening of muscles
lividity - pooling of blood
algor mortis - cooling of body
clouding of corneas
evidance of decomp
drying of tissues
Main nutrients found in food - ANS CARBS
LIPIDS
PROTEINS
How can they be detected in food? - ANS STARCH - Iodine solution, brown to dark purple
PROTEIN - Burret stain, light blue to violet
GLUCOSE - Benedicts solution, light blue to dark orange
LIPIDS - paper
@COPYRIGHT ALL RIGHTS RESERVED PAGE 2 OF 14
QUESTIONS AND ANSWERS 2026
VERIFIED.
Microscope levels - ANS 4x scanning, 10x, low, 40x, high
objective lenses
parts of microscope - ANS objective lessons, fine focus knob, course focus, stage clips,
diaphragm, base, stage, arm, eyepiece, body tube, light source
types of fingerprint - ANS loop - like the swirl
arch - like a bump
tentarch - steeper arch, from both sides
doubleloop - exactly what it sound like, my thumb
pocket loop - loop with bulleye in center
whorl - bullseye
mixed - weird no catagory
Blood indicator - ANS if it clots up, then the blood is the blood of the indicator
crime scene methods - ANS link method - association with evidance
line/strip method - proceed along straight lines, large outdoor crime scenes.
grid - same but both ways
@COPYRIGHT ALL RIGHTS RESERVED PAGE 1 OF 14
, zone - split into zones, methods in each zone
spiral - in or out to in, large, no physical barriers
wheel ray - small circular crime scenes
how do scientists design experiments to find the most accurate answer to the question? -
ANS design experiment around question
scientific method and applicable variables
How are bloodstain patterns left at a crime scene used to help find out what happened during a
crime? - ANS the way a blood spatter splatters can tell about how they were hit, violent or
non-violent.
Types of signs after death - ANS rigor mortis - stiffening of muscles
lividity - pooling of blood
algor mortis - cooling of body
clouding of corneas
evidance of decomp
drying of tissues
Main nutrients found in food - ANS CARBS
LIPIDS
PROTEINS
How can they be detected in food? - ANS STARCH - Iodine solution, brown to dark purple
PROTEIN - Burret stain, light blue to violet
GLUCOSE - Benedicts solution, light blue to dark orange
LIPIDS - paper
@COPYRIGHT ALL RIGHTS RESERVED PAGE 2 OF 14
