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Questions and Answers
What is the primary purpose of PCR (Polymerase Chain Reaction)?
What is the primary purpose of PCR (Polymerase Chain Reaction)?
- Amplifying or copying DNA sequences. (correct)
- Reversing the charge of DNA for electrophoresis.
- Creating RFLPs (Restriction Fragment Length Polymorphisms).
- Cutting DNA into smaller fragments.
Based on base-pairing rules, if a DNA strand has the sequence ACGGT, what would be its complementary strand?
Based on base-pairing rules, if a DNA strand has the sequence ACGGT, what would be its complementary strand?
- ACCGT
- TGCCA
- TGGCA (correct)
- ACGGT
During PCR, which enzyme is responsible for adding complementary bases to the template strand?
During PCR, which enzyme is responsible for adding complementary bases to the template strand?
- RNA Polymerase
- Helicase
- DNA Polymerase (correct)
- Thermonuclease
How do scientists typically cut DNA into smaller, manageable fragments?
How do scientists typically cut DNA into smaller, manageable fragments?
What is the primary function of CODIS (Combined DNA Index System)?
What is the primary function of CODIS (Combined DNA Index System)?
What molecular biology technique is most appropriate when biologists need to create numerous copies of a specific DNA fragment?
What molecular biology technique is most appropriate when biologists need to create numerous copies of a specific DNA fragment?
In the human body, where is DNA primarily located?
In the human body, where is DNA primarily located?
What term describes the pattern of DNA fragments unique to an individual, obtained during DNA analysis?
What term describes the pattern of DNA fragments unique to an individual, obtained during DNA analysis?
During gel electrophoresis, which DNA strands migrate through the gel the fastest?
During gel electrophoresis, which DNA strands migrate through the gel the fastest?
What is the net electrical charge of DNA?
What is the net electrical charge of DNA?
What technique enables DNA to be copied outside of a living cell?
What technique enables DNA to be copied outside of a living cell?
Which of the following statements about DNA is FALSE?
Which of the following statements about DNA is FALSE?
DNA fragments can be sorted based on their size using which technique?
DNA fragments can be sorted based on their size using which technique?
What does the acronym CODIS stand for in the context of forensic DNA analysis?
What does the acronym CODIS stand for in the context of forensic DNA analysis?
What enzyme targets a specific base sequence and cuts DNA into smaller fragments?
What enzyme targets a specific base sequence and cuts DNA into smaller fragments?
Starting with two double-stranded DNA molecules, how many double-stranded DNA molecules would result after two cycles of PCR, assuming 100% efficiency?
Starting with two double-stranded DNA molecules, how many double-stranded DNA molecules would result after two cycles of PCR, assuming 100% efficiency?
On an electropherogram resulting from STR analysis, how are alleles typically represented?
On an electropherogram resulting from STR analysis, how are alleles typically represented?
If only one allele (one peak) is observed on an electropherogram for a particular STR locus, what does this indicate about the genotype at that locus?
If only one allele (one peak) is observed on an electropherogram for a particular STR locus, what does this indicate about the genotype at that locus?
How many core STR regions are typically analyzed for CODIS in the United States?
How many core STR regions are typically analyzed for CODIS in the United States?
Which two molecules form the sides (backbone) of the DNA ladder structure?
Which two molecules form the sides (backbone) of the DNA ladder structure?
Within the DNA sequence TGCACGATCATCATCATAGCCCT, which region is repeated three times?
Within the DNA sequence TGCACGATCATCATCATAGCCCT, which region is repeated three times?
On human chromosomes, what characteristic does the AMEL locus (location) indicate?
On human chromosomes, what characteristic does the AMEL locus (location) indicate?
At a particular STR locus, an individual has two different lengths of the STR repeat. How is the frequency of this genotype calculated for population genetics?
At a particular STR locus, an individual has two different lengths of the STR repeat. How is the frequency of this genotype calculated for population genetics?
Who is credited with discovering DNA fingerprinting?
Who is credited with discovering DNA fingerprinting?
Since STR segments are inherited from parents, how many alleles do you possess for each STR segment?
Since STR segments are inherited from parents, how many alleles do you possess for each STR segment?
During PCR, at what temperature is the initial melting stage used to separate DNA into single strands?
During PCR, at what temperature is the initial melting stage used to separate DNA into single strands?
Which choice below best describes non-coding DNA?
Which choice below best describes non-coding DNA?
Will the sugar phosphate backbone structure vary from different sources of DNA?
Will the sugar phosphate backbone structure vary from different sources of DNA?
Will DNA samples taken from a person and a Twin have the same bases?
Will DNA samples taken from a person and a Twin have the same bases?
What sequence do restriction enzymes use to determine where to cut portions of DNA?
What sequence do restriction enzymes use to determine where to cut portions of DNA?
Flashcards
Purpose of PCR
Purpose of PCR
To amplify or create many copies of a specific DNA segment.
Complementary DNA Strand
Complementary DNA Strand
According to base-pairing rules, if one strand is ACGGT, the complementary strand is TGCCA.
PCR Enzyme
PCR Enzyme
DNA Polymerase is the enzyme used during PCR to pair complementary bases to the template strand.
Cutting DNA
Cutting DNA
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CODIS
CODIS
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Copying DNA Fragments
Copying DNA Fragments
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Location of DNA
Location of DNA
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DNA Fingerprinting
DNA Fingerprinting
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DNA Movement
DNA Movement
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Charge of DNA
Charge of DNA
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DNA Copying Technique
DNA Copying Technique
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DNA Coding
DNA Coding
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DNA Sorting Technique
DNA Sorting Technique
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CODIS Meaning
CODIS Meaning
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Restriction Enzyme
Restriction Enzyme
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PCR Cycle Output
PCR Cycle Output
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Allele Representation
Allele Representation
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Homozygous Genotype
Homozygous Genotype
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CODIS STR Regions
CODIS STR Regions
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DNA Backbone
DNA Backbone
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Repeated DNA Region
Repeated DNA Region
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AMEL Locus
AMEL Locus
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DNA Fingerprinting Discoverer
DNA Fingerprinting Discoverer
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STR Alleles
STR Alleles
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Denaturation in PCR
Denaturation in PCR
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Variable DNA Type
Variable DNA Type
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Are base sequencing same or different among individuals?
Are base sequencing same or different among individuals?
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How do restriction enzymes know what DNA to cut?
How do restriction enzymes know what DNA to cut?
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Measuring DNA fragment size
Measuring DNA fragment size
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DNA structure
DNA structure
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Study Notes
- PCR is used for amplifying/copying DNA.
- According to base-pairing rules (Adenine with Thymine, Cytosine with Guanine), the complementary strand to ACGGT is TGGCA.
- DNA Polymerase is the enzyme used during PCR to pair complementary bases to the template strand.
- Scientists use restriction enzymes to cut DNA into smaller strands.
- The computerized database used to store DNA information is CODIS (Combined DNA Index System).
- Biologists use PCR to create additional copies of a DNA fragment.
- DNA is found in a cell's nucleus.
- DNA Fingerprinting is the pattern of DNA fragments obtained by examining a person's unique sequence of DNA base pairs.
- Short strands of DNA move the fastest through the gel during electrophoresis.
- DNA has a negative charge.
- PCR (polymerase chain reaction) is a technique that allows DNA to be copied outside a living cell.
- Not all of the letter sequences in DNA code for the production of proteins.
- Electrophoresis is a technique used to sort DNA fragments according to their size.
- CODIS stands for Combined DNA Index System.
- A restriction enzyme is a special protein that targets a specific base sequence and cuts DNA into smaller fragments.
- If two double-stranded DNA molecules are used at the beginning of PCR, 8 double-stranded DNA molecules can be obtained after two cycles.
- On an electropherogram, alleles are represented by peaks on a graph.
- If there is only one allele (one peak) on the electropherogram for a particular locus, the genotype is homozygous.
- 13 STR (short tandem repeat) regions are analyzed for CODIS in the U.S.
- Deoxyribose sugar and phosphate form the sides (backbone) of the DNA ladder.
- The region CAT is repeated 3 times in the sequence TGCACGATCATCATCATAGCCCT.
- On human chromosomes, the locus (location) marked AMEL is a person's gender.
- For frequency, if two different lengths of the STR repeat are present at a particular STR locus on a person's chromosomes, the multiplication process is 2x (1st # of repeats x 2nd # of repeats).
- Alec Jeffreys is credited for discovering DNA fingerprinting.
- For each STR segment, there are 2 alleles inherited from parents.
- DNA fingerprinting works because no two people, except identical twins, have exactly the same DNA.
- Mitochondrial DNA is inherited from just mom.
- During PCR, denaturation is the step where the temperature is increased to separate DNA strands.
- If two double-stranded DNA molecules are used at the beginning of a PCR process, 8 double-stranded DNA molecules can be obtained after two cycles.
- The region CAT is repeated 3 times in the sequence TGCACGATCATCATCATAGCCCT.
- DNA can be degraded or destroyed by moisture, heat, and sunlight.
- Non-coding DNA varies most among individuals and is used to create DNA fingerprints.
- There are no differences when considering the sugar-phosphate backbone structure of DNA from various sources.
- All DNA samples contain the same bases, but the base sequencing varies among individuals.
- Restriction enzymes look for a specific sequence within the bases and then cut between specific bases.
- If EcoRI cuts between GA in the sequence GAATTC, then digesting the sequence ATGAATTCTCAATTACCT would result in 2 fragments of DNA.
- The size of the DNA fragment AATTCGCTAGTA would be correctly indicated as 12bp.
- DNA can have forensic value even if it is decades old.
- The physical structure of a DNA molecule is called a double helix.
- DNA can place a person at a crime scene, even if they claim they have never been there.
- DNA contains genetic information.
- The order and sequence of adenine, thymine, guanine, and cytosine determine an organism's genetic code.
- All living things have DNA.
- DNA is found on chromosomes located in the nucleus of cells.
- DNA evidence can refute a claim of self-defense, link two or more crime scenes.
- Alleles are alternate forms of a trait (the possibilities).
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