DNA Technology

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Questions and Answers

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?

  • ACCGT
  • TGCCA
  • TGGCA (correct)
  • ACGGT

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?

<p>Restriction enzymes (A)</p> Signup and view all the answers

What is the primary function of CODIS (Combined DNA Index System)?

<p>A computerized database used to store DNA information. (A)</p> Signup and view all the answers

What molecular biology technique is most appropriate when biologists need to create numerous copies of a specific DNA fragment?

<p>PCR (Polymerase Chain Reaction) (D)</p> Signup and view all the answers

In the human body, where is DNA primarily located?

<p>Cell nucleus (A)</p> Signup and view all the answers

What term describes the pattern of DNA fragments unique to an individual, obtained during DNA analysis?

<p>DNA Fingerprinting (C)</p> Signup and view all the answers

During gel electrophoresis, which DNA strands migrate through the gel the fastest?

<p>The short strands (D)</p> Signup and view all the answers

What is the net electrical charge of DNA?

<p>Negative (D)</p> Signup and view all the answers

What technique enables DNA to be copied outside of a living cell?

<p>PCR (Polymerase Chain Reaction) (D)</p> Signup and view all the answers

Which of the following statements about DNA is FALSE?

<p>All DNA sequences code for the production of proteins. (A)</p> Signup and view all the answers

DNA fragments can be sorted based on their size using which technique?

<p>Electrophoresis (B)</p> Signup and view all the answers

What does the acronym CODIS stand for in the context of forensic DNA analysis?

<p>Combined DNA Index System (A)</p> Signup and view all the answers

What enzyme targets a specific base sequence and cuts DNA into smaller fragments?

<p>Restriction Enzyme (A)</p> Signup and view all the answers

Starting with two double-stranded DNA molecules, how many double-stranded DNA molecules would result after two cycles of PCR, assuming 100% efficiency?

<p>8 (D)</p> Signup and view all the answers

On an electropherogram resulting from STR analysis, how are alleles typically represented?

<p>Peaks on a graph (D)</p> Signup and view all the answers

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?

<p>The genotype is homozygous. (A)</p> Signup and view all the answers

How many core STR regions are typically analyzed for CODIS in the United States?

<p>13 (C)</p> Signup and view all the answers

Which two molecules form the sides (backbone) of the DNA ladder structure?

<p>Deoxyribose sugar and phosphate (B)</p> Signup and view all the answers

Within the DNA sequence TGCACGATCATCATCATAGCCCT, which region is repeated three times?

<p>CAT (A)</p> Signup and view all the answers

On human chromosomes, what characteristic does the AMEL locus (location) indicate?

<p>Gender (B)</p> Signup and view all the answers

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?

<p>$2 \times (1^{st} \text{ number of repeats} \times 2^{nd} \text{ number of repeats})$ (A)</p> Signup and view all the answers

Who is credited with discovering DNA fingerprinting?

<p>Alec Jeffreys (B)</p> Signup and view all the answers

Since STR segments are inherited from parents, how many alleles do you possess for each STR segment?

<p>2 (D)</p> Signup and view all the answers

During PCR, at what temperature is the initial melting stage used to separate DNA into single strands?

<p>Denaturation (D)</p> Signup and view all the answers

Which choice below best describes non-coding DNA?

<p>DNA that varies the most among individuals and used to create DNA fingerprints. (B)</p> Signup and view all the answers

Will the sugar phosphate backbone structure vary from different sources of DNA?

<p>No (A)</p> Signup and view all the answers

Will DNA samples taken from a person and a Twin have the same bases?

<p>Yes - if the DNA comes from identical twins (D)</p> Signup and view all the answers

What sequence do restriction enzymes use to determine where to cut portions of DNA?

<p>They look for a specific sequence within the bases and then cut between specific bases (D)</p> Signup and view all the answers

Flashcards

Purpose of PCR

To amplify or create many copies of a specific DNA segment.

Complementary DNA Strand

According to base-pairing rules, if one strand is ACGGT, the complementary strand is TGCCA.

PCR Enzyme

DNA Polymerase is the enzyme used during PCR to pair complementary bases to the template strand.

Cutting DNA

Restriction enzymes are used to cut DNA at specific sequences into smaller fragments.

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CODIS

CODIS is the computerized database used to store DNA information.

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Copying DNA Fragments

PCR (Polymerase Chain Reaction) is used to make additional copies of a DNA fragment.

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Location of DNA

DNA is found in the cell's nucleus.

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DNA Fingerprinting

DNA Fingerprinting is the pattern of DNA fragments obtained by examining a person's unique sequence of DNA base pairs.

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DNA Movement

Short DNA strands move faster through the gel during electrophoresis.

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Charge of DNA

DNA has a negative charge due to the phosphate groups in its structure.

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DNA Copying Technique

PCR allows DNA to be copied outside a living cell.

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DNA Coding

Not all letter sequences in DNA code for proteins; much of the human genome is "junk" DNA.

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DNA Sorting Technique

Electrophoresis is used to sort DNA fragments according to size.

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CODIS Meaning

CODIS stands for Combined DNA Index System.

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Restriction Enzyme

A restriction enzyme is a special protein that targets a specific base sequence and cuts DNA into smaller fragments.

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PCR Cycle Output

After two cycles of PCR, starting with two double-stranded DNA molecules, you obtain eight double-stranded DNA molecules.

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Allele Representation

Peaks on a graph represent alleles on an electropherogram.

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Homozygous Genotype

If there is only one allele on an electropherogram for a particular locus, the genotype is homozygous.

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CODIS STR Regions

13 STR regions are analyzed for CODIS in the U.S.

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DNA Backbone

Deoxyribose sugar and phosphate form the sides (backbone) of the DNA ladder.

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Repeated DNA Region

CAT is repeated three times in the sequence TGCACGATCATCATCATAGCCCT.

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AMEL Locus

On human chromosomes, the locus (location) marked AMEL is a person's gender.

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DNA Fingerprinting Discoverer

Alec Jeffreys is credited with discovering DNA fingerprinting.

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STR Alleles

For each STR segment, you have 2 alleles, one inherited from each parent.

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Denaturation in PCR

During PCR, denaturation is the step when the temperature is increased to separate DNA strands.

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Variable DNA Type

Non-coding DNA varies most among individuals and is used to create DNA fingerprints.

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Are base sequencing same or different among individuals?

Yes, but the base sequencing varies among individuals .

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How do restriction enzymes know what DNA to cut?

They look for a specific sequence within the bases and then cut between specific bases

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Measuring DNA fragment size

AATTCGCTAGTA is 12 BP.

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DNA structure

The structure in the picture shown is the double helix.

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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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