PLTW Biomed Midterm Review UPDATED
ACTUAL Exam Questions and CORRECT
Answers
How can blood types be found? - CORRECT ANSWER - by adding antibodies to the
blood to see if the blood clumps
What are an antigen? - CORRECT ANSWER - a toxin or other foreign substance that
causes your immune system to produce antibodies against it
What is the liquid portion of the blood called? - CORRECT ANSWER - plasma
Why does blood clump? - CORRECT ANSWER - due to the antibody binding to the
antigen. antibodies are specific to each antigen so only B antibodies will bind with B antigens
What are the four blood types? - CORRECT ANSWER - O, A, B, AB
What does clumping show when blood typing? - CORRECT ANSWER - A clumps with
Anti-A Serum, B clumps with Anti-B Serum, AB clumps with both and O clumps with neither
What evidence from a crime scene would contain DNA? - CORRECT ANSWER - blood,
hair, skin, and saliva
What are the three main types of fingerprints? - CORRECT ANSWER - arch, loop, and
whorl
What are ridge endings and bifurcations? - CORRECT ANSWER - parts of fingerprint
classification
, What is hair made of? - CORRECT ANSWER - keratin, which is a protein found
throughout our integumentary system
What are the three layers of hair? - CORRECT ANSWER - medulla, cortex and cuticle (in
order from inside to outside)
What is rigor mortis, algor mortis, lividity and Etomology? - CORRECT ANSWER - rigor
mortis- tightening of the muscles after death
algor mortis- internal temperature cooling
lividity- blood pooling
Etomology- study of bugs and when they arrive after death
What are some factors that affect algor mortis? - CORRECT ANSWER - clothing, original
internal temp, ambient temperature, environment, and body size
What are null hypothesis and alternative hypothesis? - CORRECT ANSWER - null
hypothesis- a hypothesis that assumes everything will stay the same (caffeine will have no effect
on blood sugar)
alternative hypothesis- a hypothesis that describes the outcome that is predicted (caffeine will
affect blood sugar)
What is standardization? - CORRECT ANSWER - each group should have the same
conditions as each other except for the independent variable (each group should have the same
type of diabetes, same diet, and same physical activity)
What are negative and positive control? - CORRECT ANSWER - negative control-
nothing should happen to this group (people without caffeine)
positive control- a group used to show what a positive result looks like
What affects blood spatter stains? - CORRECT ANSWER - force, height, amount of
blood, angle, objects in the way, and how close the victim is to the perpetrator.
ACTUAL Exam Questions and CORRECT
Answers
How can blood types be found? - CORRECT ANSWER - by adding antibodies to the
blood to see if the blood clumps
What are an antigen? - CORRECT ANSWER - a toxin or other foreign substance that
causes your immune system to produce antibodies against it
What is the liquid portion of the blood called? - CORRECT ANSWER - plasma
Why does blood clump? - CORRECT ANSWER - due to the antibody binding to the
antigen. antibodies are specific to each antigen so only B antibodies will bind with B antigens
What are the four blood types? - CORRECT ANSWER - O, A, B, AB
What does clumping show when blood typing? - CORRECT ANSWER - A clumps with
Anti-A Serum, B clumps with Anti-B Serum, AB clumps with both and O clumps with neither
What evidence from a crime scene would contain DNA? - CORRECT ANSWER - blood,
hair, skin, and saliva
What are the three main types of fingerprints? - CORRECT ANSWER - arch, loop, and
whorl
What are ridge endings and bifurcations? - CORRECT ANSWER - parts of fingerprint
classification
, What is hair made of? - CORRECT ANSWER - keratin, which is a protein found
throughout our integumentary system
What are the three layers of hair? - CORRECT ANSWER - medulla, cortex and cuticle (in
order from inside to outside)
What is rigor mortis, algor mortis, lividity and Etomology? - CORRECT ANSWER - rigor
mortis- tightening of the muscles after death
algor mortis- internal temperature cooling
lividity- blood pooling
Etomology- study of bugs and when they arrive after death
What are some factors that affect algor mortis? - CORRECT ANSWER - clothing, original
internal temp, ambient temperature, environment, and body size
What are null hypothesis and alternative hypothesis? - CORRECT ANSWER - null
hypothesis- a hypothesis that assumes everything will stay the same (caffeine will have no effect
on blood sugar)
alternative hypothesis- a hypothesis that describes the outcome that is predicted (caffeine will
affect blood sugar)
What is standardization? - CORRECT ANSWER - each group should have the same
conditions as each other except for the independent variable (each group should have the same
type of diabetes, same diet, and same physical activity)
What are negative and positive control? - CORRECT ANSWER - negative control-
nothing should happen to this group (people without caffeine)
positive control- a group used to show what a positive result looks like
What affects blood spatter stains? - CORRECT ANSWER - force, height, amount of
blood, angle, objects in the way, and how close the victim is to the perpetrator.
