Chapter 7: DNA Profile Exam

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| By Shannon Gilroy
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Shannon Gilroy
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Quizzes Created: 9 | Total Attempts: 7,995
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Chapter 7: DNA Profile Exam - Quiz


Questions and Answers
  • 1. 

    Two men were involved in a paternity suit brought by a woman against her estranged husband. The woman was seeking child support for her infant from her husband, but the husband accused the woman's lover of being the biological father. Unfortunately, blood typing was inconclusive: both men had the same blood type. So the judge ordered DNA analysis. A sample of blood was taken from the mother, the baby, and both men. The results are shown below. Who is the father of the baby? Which band was most useful in making your decision? 

  • 2. 

    The pattern of DNA fragments created through the process of gel electrophoresis.

    • A.

      DNA Fingerprint

    • B.

      PCR

    • C.

      STR

    • D.

      VNTR

    Correct Answer
    A. DNA Fingerprint
    Explanation
    The correct answer is DNA Fingerprint. Gel electrophoresis is a technique used to separate DNA fragments based on their size and charge. The resulting pattern of DNA fragments is known as a DNA fingerprint. DNA fingerprints are unique to each individual (except identical twins) and can be used for various purposes such as forensic analysis, paternity testing, and identification of genetic disorders. PCR, STR, and VNTR are also techniques used in DNA analysis, but they do not specifically refer to the pattern of DNA fragments created through gel electrophoresis.

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  • 3. 

    A segment of DNA that codes for a protein or trait.

    • A.

      Gene

    • B.

      Allele

    • C.

      Chromosome

    • D.

      PCR

    Correct Answer
    A. Gene
    Explanation
    A gene is a segment of DNA that contains the instructions for building a specific protein or determining a particular trait. It is the basic unit of heredity and is responsible for the transmission of genetic information from one generation to the next. Genes play a crucial role in determining an organism's characteristics and functions, as they provide the blueprint for the production of proteins that carry out various biological processes in the body.

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  • 4. 

    A molecule that cuts a DNA molecule at a specific base sequence

    • A.

      Restriction Enzyme

    • B.

      PCR

    • C.

      STR

    • D.

      VNTR

    Correct Answer
    A. Restriction Enzyme
    Explanation
    A restriction enzyme is a molecule that cuts a DNA molecule at a specific base sequence. This enzyme recognizes a specific sequence of bases in the DNA molecule and cuts the DNA at that site, creating fragments with sticky ends. These enzymes are widely used in molecular biology research to manipulate DNA, such as cloning genes or creating recombinant DNA molecules. Restriction enzymes play a crucial role in genetic engineering and DNA analysis techniques. PCR, STR, and VNTR are not molecules that cut DNA at specific base sequences, so they are not the correct answer.

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  • 5. 

    Tandem repeats of short DNA sequences 2-5 base pairs in length.

    • A.

      STR

    • B.

      VNTR

    • C.

      PCR

    • D.

      Allele

    Correct Answer
    A. STR
    Explanation
    STR stands for short tandem repeats, which are repeated sequences of DNA that are typically 2-5 base pairs in length. These repeats are found throughout the genome and can vary in length between individuals, making them useful for genetic profiling. STR analysis involves using PCR (polymerase chain reaction) to amplify these repeat regions, and the resulting DNA fragments can be separated and analyzed to determine the number of repeats present. This information can then be used to compare DNA samples and identify individuals or determine familial relationships.

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  • 6. 

    The process where DNA is cut and placed on a gel where it moves based on size to create a pattern is known as Gel Electrophoresis.

    • A.

      True

    • B.

      False

    Correct Answer
    A. True
    Explanation
    Gel electrophoresis is a commonly used technique in molecular biology to separate and analyze DNA fragments based on their size. In this process, DNA is cut into smaller fragments using restriction enzymes and then loaded onto a gel. An electric current is applied to the gel, causing the DNA fragments to move through the gel matrix. Since smaller fragments move faster than larger ones, this creates a pattern or banding pattern of DNA fragments on the gel. Therefore, the given statement that gel electrophoresis is the process where DNA is cut and placed on a gel to create a pattern based on size is true.

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  • 7. 

    DNA in a gel electrophoresis separates based on its size.

    • A.

      True

    • B.

      False

    Correct Answer
    A. True
    Explanation
    In gel electrophoresis, DNA molecules are separated based on their size. This is because the gel matrix acts as a molecular sieve, with smaller DNA fragments able to move more easily through the pores of the gel, while larger fragments are hindered and move more slowly. As a result, DNA fragments of different sizes can be separated and visualized as distinct bands on the gel. Therefore, the statement "DNA in a gel electrophoresis separates based on its size" is true.

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  • 8. 

    When DNA moves through the gel, the larger size fragments travel the furthest.

    • A.

      True

    • B.

      False

    Correct Answer
    B. False
    Explanation
    In gel electrophoresis, DNA fragments are separated based on their size. Smaller fragments move more quickly through the gel matrix, while larger fragments move more slowly. Therefore, the correct statement is that smaller size fragments travel the furthest, not larger size fragments.

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  • 9. 

    DNA can be extracted from blood, semen, saliva, and hair follicles.

    • A.

      True

    • B.

      False

    Correct Answer
    A. True
    Explanation
    DNA can be extracted from various sources such as blood, semen, saliva, and hair follicles. These sources contain cells that contain DNA, which can be isolated and extracted using various techniques. This allows for genetic analysis and identification, as DNA carries the unique genetic information of an individual. Therefore, the statement that DNA can be extracted from blood, semen, saliva, and hair follicles is true.

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  • 10. 

    By comparing the DNA from a crime scene to various suspects, forensics examiners can link a suspect to a crime scene.

    • A.

      True

    • B.

      False

    Correct Answer
    A. True
    Explanation
    Forensics examiners can compare the DNA found at a crime scene to the DNA of various suspects. If there is a match between the DNA from the crime scene and the DNA of a suspect, it indicates that the suspect was present at the crime scene and therefore can be linked to the crime. This process is a crucial tool in solving crimes and identifying perpetrators.

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  • 11. 

    A gene that has more than one alternating form, like those that code for various blood types is known as a(n): 

    • A.

      Allele

    • B.

      Chromosome

    • C.

      Gene

    • D.

      STR

    Correct Answer
    A. Allele
    Explanation
    A gene that has more than one alternating form, like those that code for various blood types, is known as an allele. Alleles are different versions of a gene that can produce different traits or characteristics. In the case of blood types, there are multiple alleles for the gene that codes for the proteins on the surface of red blood cells, resulting in different blood types such as A, B, AB, or O.

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  • 12. 

    There are 46 __________________ in human cells, which are long strand of DNA found in the nucleus.

    • A.

      Chromosomes

    • B.

      Alleles

    • C.

      Genes

    • D.

      PCRs

    Correct Answer
    A. Chromosomes
    Explanation
    Chromosomes are the correct answer because they are the long strands of DNA found in the nucleus of human cells. They carry genetic information and are responsible for the transmission of traits from parents to offspring. Each human cell typically contains 46 chromosomes, except for reproductive cells which have 23 chromosomes.

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  • 13. 

    A molecule labeled with a radioactive isotope that attaches to a particular sequence of DNA is known as a: 

    • A.

      Probe

    • B.

      PCR

    • C.

      Allele

    • D.

      Chromosome

    Correct Answer
    A. Probe
    Explanation
    A molecule labeled with a radioactive isotope that attaches to a particular sequence of DNA is known as a probe. Probes are commonly used in molecular biology to detect and identify specific DNA sequences. They can be used to locate and visualize specific genes or genetic markers, as well as to identify genetic variations or mutations. By attaching to the target DNA sequence, the probe allows scientists to track and study specific regions of the genome.

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  • 14. 

    A method of separating DNA molecules based on size by passing them through a argarose gel to create a DNA fingerprint.

    • A.

      Electrophoresis

    • B.

      Gene

    • C.

      PCR

    • D.

      STR

    Correct Answer
    A. Electrophoresis
    Explanation
    Electrophoresis is a technique used to separate DNA molecules based on their size by passing an electric current through a gel matrix, such as agarose gel. The DNA molecules move through the gel at different rates depending on their size, creating distinct bands or patterns called DNA fingerprints. This process is commonly used in DNA analysis for various purposes, including genetic testing, forensic investigations, and paternity testing. Therefore, electrophoresis is the correct answer as it accurately describes the method of separating DNA molecules based on size using agarose gel.

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  • 15. 

    A method used to replicate small samples of DNA in to millions of copies is known as

    • A.

      PCR

    • B.

      STR

    • C.

      VNTR

    • D.

      Restriction enzyme

    Correct Answer
    A. PCR
    Explanation
    PCR stands for Polymerase Chain Reaction, which is a method used to amplify or replicate small samples of DNA into millions of copies. It involves a series of temperature changes that allow DNA strands to separate, primers to bind, and DNA polymerase to synthesize new DNA strands. This process is widely used in various fields of research, diagnostics, and forensic analysis, as it enables the rapid production of large amounts of DNA from a small initial sample. STR (Short Tandem Repeat) and VNTR (Variable Number Tandem Repeat) are different types of genetic markers used in DNA profiling, while restriction enzymes are enzymes that cut DNA at specific recognition sites.

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  • 16. 

    GGCTCTGGATCGCTAG|GGCTCTGGATCGCTAG|GGCTCTGGATCGCTAGThe DNA code above repeats 3 times and would be classified as a

    • A.

      Variable number tandem repeat

    • B.

      Short tandem repeat

    • C.

      PCR

    • D.

      Gel Electrophoresis

    Correct Answer
    A. Variable number tandem repeat
    Explanation
    The given DNA code repeats 3 times, indicating a variable number tandem repeat (VNTR). VNTRs are regions in the DNA where a short sequence of nucleotides is repeated multiple times, but the number of repeats can vary between individuals. This type of genetic variation is often used in forensic analysis and paternity testing.

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  • 17. 

    DNA from a Crime Scene was deposited in row 1. DNA was obtained from suspects Bob, Sue, John , and Lisa. Which suspects DNA matches the crime scene DNA?

    • A.

      Bob

    • B.

      Sue

    • C.

      John

    • D.

      Lisa

    Correct Answer
    C. John
    Explanation
    Based on the information given, the DNA obtained from John matches the DNA found at the crime scene.

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  • 18. 

    P=Crime Scene DNA, S1=Suspect 1, S2= Suspect 2, S3=Suspect 3.Which suspect left DNA at the Crime Scene?

    • A.

      P

    • B.

      S1

    • C.

      S2

    • D.

      S3

    Correct Answer
    C. S2
    Explanation
    Suspect 2 left DNA at the crime scene.

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  • 19. 

    DNA from a crime scene matched that of a suspect. This means that the suspect, without a doubt, committed the crime. 

    • A.

      True

    • B.

      False

    Correct Answer
    B. False
    Explanation
    The statement is incorrect. While a DNA match between the crime scene and the suspect may indicate their involvement, it does not provide definitive proof of their guilt. Other factors such as motive, opportunity, and corroborating evidence are necessary to establish guilt beyond a reasonable doubt. Therefore, it is not accurate to say that the suspect, without a doubt, committed the crime based solely on a DNA match.

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Quiz Review Timeline +

Our quizzes are rigorously reviewed, monitored and continuously updated by our expert board to maintain accuracy, relevance, and timeliness.

  • Current Version
  • Mar 20, 2023
    Quiz Edited by
    ProProfs Editorial Team
  • Dec 03, 2014
    Quiz Created by
    Shannon Gilroy
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