PLTW Biomedical Science Unit 1 Review
UPDATED Exam Questions and
CORRECT Answers
What can be done at a scene of a mysterious death to help reconstruct what happened? -
CORRECT ANSWER - Protect the crime scene.
Photograph the scene with rulers for size estimation.
Examine the crime scene for all evidence in an orderly fashion.
Collect and document all physical evidence.
Interview witnesses, possible suspects, and known associates.
How do the clues found at a scene of a mysterious death help investigators determine what might
have occurred and help identify or exonerate potential suspects? - CORRECT ANSWER -
Clues help because investigators can analyze them and see a certain pattern or way in which the
death happened based on the clues display. They also can be tested for DNA and can determine
or exonerate suspects. They can usually get a general idea about what happened and who may
have been involved based on all the clues.
How do scientists design experiments to find the most accurate answer to the question they are
asking? - CORRECT ANSWER - Scientists use scientific methods to design experiments.
They first identify the question, research, hypothesis, experiment, analyze, conclusion, and
summary. The scientific method helps them find the answer to their testable question. This is
probably the most accurate way they can answer their questions.
What is the difference between a dependent and an independent variable? - CORRECT
ANSWER - The dependent variable relies on the output of the independent variable.
The Independent variable acts independently of its environment; Doesn't rely on any other
factors.
How are bloodstain patterns left at a crime scene used to help investigators? - CORRECT
ANSWER - Bloodstain patterns are very helpful in determining what happened leading up
to death> Smudges, smears, splatters, and sprays all point to different events, which is the same
for every bloodstain. They then analyze the blood and come up with possible theories.
, Know how to use the Glaister's equation. - CORRECT ANSWER - 98.4- recorded
temp/1.5= Hours since death
What is DNA? - CORRECT ANSWER - A double-stranded, helical nucleic acid molecule
capable of replicating and determining the inherited structure of a cell's proteins.
What is nucleotide made of? - CORRECT ANSWER - It is made up of three components:
A nitrogen-containing base, A five-carbon sugar, and a phosphate group.
What elements make up each part of the nucleotide? - CORRECT ANSWER -
Deoxyribose
Phosphate Group
Nitrogenous Base
What is the twisted-ladder structure of DNA called? - CORRECT ANSWER - Double
Helix
How does DNA differ from person to person? - CORRECT ANSWER - From person to
person, the order and structure of AGTC is different providing the variations.
How do scientists isolate DNA in order to study it? In other words, how can tools of molecular
biology be used to compare the DNA of two individuals? - CORRECT ANSWER - DNA
is extracted from a person and then scientist performs a PCR to amplify DNA, making a sample
millions of times bigger than the original. they cut the DNA with restriction enzymes and run the
sample to Gel electrophoresis to analyze the size of each DNA fragment because DNA of each
individual is unique the restriction enzymes will cut each person's DNA in different places so
RFLP's will look different on the gels.
What is the base-pairing rule? If you have the DNA sequence AAGTCCAG, what would be the
DNA sequence of the complementary strand? - CORRECT ANSWER - The base-pairing
rule is that whatever amount of A (adenine) in the DNA of an organism, the amount of T
UPDATED Exam Questions and
CORRECT Answers
What can be done at a scene of a mysterious death to help reconstruct what happened? -
CORRECT ANSWER - Protect the crime scene.
Photograph the scene with rulers for size estimation.
Examine the crime scene for all evidence in an orderly fashion.
Collect and document all physical evidence.
Interview witnesses, possible suspects, and known associates.
How do the clues found at a scene of a mysterious death help investigators determine what might
have occurred and help identify or exonerate potential suspects? - CORRECT ANSWER -
Clues help because investigators can analyze them and see a certain pattern or way in which the
death happened based on the clues display. They also can be tested for DNA and can determine
or exonerate suspects. They can usually get a general idea about what happened and who may
have been involved based on all the clues.
How do scientists design experiments to find the most accurate answer to the question they are
asking? - CORRECT ANSWER - Scientists use scientific methods to design experiments.
They first identify the question, research, hypothesis, experiment, analyze, conclusion, and
summary. The scientific method helps them find the answer to their testable question. This is
probably the most accurate way they can answer their questions.
What is the difference between a dependent and an independent variable? - CORRECT
ANSWER - The dependent variable relies on the output of the independent variable.
The Independent variable acts independently of its environment; Doesn't rely on any other
factors.
How are bloodstain patterns left at a crime scene used to help investigators? - CORRECT
ANSWER - Bloodstain patterns are very helpful in determining what happened leading up
to death> Smudges, smears, splatters, and sprays all point to different events, which is the same
for every bloodstain. They then analyze the blood and come up with possible theories.
, Know how to use the Glaister's equation. - CORRECT ANSWER - 98.4- recorded
temp/1.5= Hours since death
What is DNA? - CORRECT ANSWER - A double-stranded, helical nucleic acid molecule
capable of replicating and determining the inherited structure of a cell's proteins.
What is nucleotide made of? - CORRECT ANSWER - It is made up of three components:
A nitrogen-containing base, A five-carbon sugar, and a phosphate group.
What elements make up each part of the nucleotide? - CORRECT ANSWER -
Deoxyribose
Phosphate Group
Nitrogenous Base
What is the twisted-ladder structure of DNA called? - CORRECT ANSWER - Double
Helix
How does DNA differ from person to person? - CORRECT ANSWER - From person to
person, the order and structure of AGTC is different providing the variations.
How do scientists isolate DNA in order to study it? In other words, how can tools of molecular
biology be used to compare the DNA of two individuals? - CORRECT ANSWER - DNA
is extracted from a person and then scientist performs a PCR to amplify DNA, making a sample
millions of times bigger than the original. they cut the DNA with restriction enzymes and run the
sample to Gel electrophoresis to analyze the size of each DNA fragment because DNA of each
individual is unique the restriction enzymes will cut each person's DNA in different places so
RFLP's will look different on the gels.
What is the base-pairing rule? If you have the DNA sequence AAGTCCAG, what would be the
DNA sequence of the complementary strand? - CORRECT ANSWER - The base-pairing
rule is that whatever amount of A (adenine) in the DNA of an organism, the amount of T
