DNA as Genetic Material Quiz
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Questions and Answers

Who first discovered the genetic role of DNA?

  • Frederick Griffith (correct)
  • Gregor Mendel
  • Dr. Sahar Jaffal
  • Someone unknown
  • What is transformation in the context of Griffith's research?

  • Change in behavior of viruses
  • Change in the chemical composition of bacteria
  • Change in the shape of bacteria
  • Change in genotype and phenotype due to assimilation of foreign DNA (correct)
  • What are bacteriophages?

  • Bacteria that infect viruses
  • Bacterial cells
  • Proteins found in viruses
  • Viruses that infect bacteria (correct)
  • What is the protective coat of a virus called?

    <p>Capsid</p> Signup and view all the answers

    What did Griffith mix with living cells of the harmless bacterium to observe transformation?

    <p>Heat-killed remains of the pathogenic strain</p> Signup and view all the answers

    What did Alfred Hershey and Martha Chase demonstrate in their experiment?

    <p>DNA is the genetic material of a phage known as T2</p> Signup and view all the answers

    According to Chargaff's rules, what is the relationship between the number of A and T bases, and the number of G and C bases in any species?

    <p>The number of A and T bases is equal, and the number of G and C bases is equal</p> Signup and view all the answers

    What did Rosalind Franklin's X-ray crystallographic images of DNA allow James Watson to deduce?

    <p>That DNA was helical</p> Signup and view all the answers

    In the Watson-Crick model, how do adenine (A) and thymine (T) form pairs?

    <p>Adenine (A) pairs only with thymine (T)</p> Signup and view all the answers

    What does DNA replication ensure?

    <p>Transmission of genetic information</p> Signup and view all the answers

    Study Notes

    Discoverers of DNA's Genetic Role

    • Frederick Griffith first discovered the genetic role of DNA through his transformation experiment.

    Transformation in Griffith's Research

    • Transformation is the process of altering the genetic material of a cell, which Griffith demonstrated by mixing a heat-killed virulent bacterium with living cells of a harmless bacterium.

    Bacteriophages

    • Bacteriophages are viruses that infect bacteria.

    Virus Structure

    • The protective coat of a virus is called a capsid.

    Griffith's Transformation Experiment

    • Griffith mixed heat-killed virulent bacteria with living cells of the harmless bacterium to observe transformation.

    Hershey-Chase Experiment

    • Alfred Hershey and Martha Chase demonstrated that DNA is the genetic material of a virus, not its protein coat.

    Chargaff's Rules

    • According to Chargaff's rules, the number of A and T bases in a DNA molecule is equal to the number of G and C bases in any species.

    Rosalind Franklin's Contribution

    • Rosalind Franklin's X-ray crystallographic images of DNA allowed James Watson to deduce the double helix structure of DNA.

    Watson-Crick Model

    • In the Watson-Crick model, adenine (A) and thymine (T) form pairs through hydrogen bonding, with A always pairing with T.

    DNA Replication

    • DNA replication ensures that the genetic information is duplicated accurately and passed on to the next generation.

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    Description

    Test your knowledge about the experiment conducted by Alfred Hershey and Martha Chase to demonstrate that DNA is the genetic material of a phage known as T2. Explore concepts related to DNA as a polymer of nucleotides and its role in providing genetic information.

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