Discovery Of DNA Warm Up 1

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John Mitchell
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Discovery Of DNA Warm Up 1 - Quiz

Welcome to the electronic biology classroom of the 21st century. This biology warm-up or bell ringer deals with basic introduction to the discovery of the DNA molecule and those scientists who contributed their research skills to the field of biochemistry. This warm up exercise allow an unlimited number of attempts to increase your learning and TEST-TAKING skills. It will generate a new set of questions for every attempt you make. I wish you high marks and good grades in the your biological science course!


Questions and Answers
  • 1. 

    Which two American researchers set out to test whether DNA or protein was the hereditary material viruses transfer when entering a bacterium?

    • A.

      Griffth and Chase

    • B.

      Chase and Oswald

    • C.

      Watson and Crick

    • D.

      Crick and Hershey

    • E.

      Chase and Hershey

    Correct Answer
    E. Chase and Hershey
    Explanation
    Chase and Hershey set out to test whether DNA or protein was the hereditary material viruses transfer when entering a bacterium.

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  • 2. 

    Which strain is  harmful of Streptoccus pneumoniae to humans?

    • A.

      S. strain

    • B.

      E. strain

    • C.

      R. strain

    • D.

      F. strain

    • E.

      E and F strain

    Correct Answer
    A. S. strain
    Explanation
    The S. strain of Streptococcus pneumoniae is harmful to humans.

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  • 3. 

    Which statement is correct concerning the experiment of Hershey and Chase?

    • A.

      DNA is the heredity material

    • B.

      Protein is the heredity material

    • C.

      RNA is the heredity material

    • D.

      Transfer RNA is the heredity material

    • E.

      Ribosomal RNA is the heredity material

    Correct Answer
    A. DNA is the heredity material
    Explanation
    The experiment conducted by Hershey and Chase provided evidence that DNA is the hereditary material. They used bacteriophages, which are viruses that infect bacteria, to investigate whether DNA or protein was responsible for carrying genetic information. They labeled the DNA of the bacteriophages with radioactive phosphorus and the protein with radioactive sulfur. After infecting the bacteria with the labeled bacteriophages, they found that only the radioactive DNA was transferred to the next generation of bacteriophages, indicating that DNA, not protein, carries the genetic information. Therefore, the correct statement is that DNA is the hereditary material.

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  • 4. 

    Which radioactive isotope is used to label proteins?

    • A.

      Sulfur - 30

    • B.

      Sulfur - 32

    • C.

      Sulfur - 35

    • D.

      Selenium - 35

    Correct Answer
    C. Sulfur - 35
    Explanation
    Sulfur-35 is the correct answer because it is a radioactive isotope that is commonly used to label proteins. Radioactive labeling is a technique used to track and study the movement and behavior of proteins within cells. Sulfur-35 can be incorporated into proteins during their synthesis, allowing researchers to track the protein's location and activity.

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  • 5. 

    Which radioactive isotope is used to label DNA?

    • A.

      Phosphorus - 30

    • B.

      Sulfur - 32

    • C.

      Phosphorus - 32

    • D.

      Selenium - 35

    • E.

      Phosphorus - 38

    Correct Answer
    C. Phosphorus - 32
    Explanation
    Phosphorus-32 is used to label DNA. Phosphorus is an essential element in DNA molecules, and the isotope Phosphorus-32 is commonly used in molecular biology research to label DNA. This isotope emits beta particles, which can be detected and used to track the movement and behavior of DNA in experiments.

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  • 6. 

    Which is NOT a strain of Streptoccus pneumoniae?

    • A.

      S. strain

    • B.

      E. strain

    • C.

      R. strain

    • D.

      F. strain

    • E.

      E and F strain

    Correct Answer
    E. E and F strain
    Explanation
    The correct answer is E and F strain because the question asks for a strain of Streptococcus pneumoniae that is not included in the options. The options include S. strain, E. strain, R. strain, F. strain, and E and F strain. Since E and F strain is included in the options, it cannot be the correct answer.

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  • 7. 

    What bacteria was the target of the Hershey-Chase Experiment using bacteriophages?

    • A.

      Bacillus anthraxis

    • B.

      Streptococcus pyogenes

    • C.

      Escherischia perfringes

    • D.

      Escherischia coli

    • E.

      Clostridium tetani

    Correct Answer
    D. Escherischia coli
    Explanation
    The Hershey-Chase Experiment used bacteriophages to determine whether DNA or protein is the genetic material of a virus. The target bacteria for this experiment was Escherichia coli, as it is a commonly studied bacterium and was easily infected by the bacteriophages used in the experiment. By labeling the DNA and protein of the bacteriophages with different radioactive isotopes, Hershey and Chase were able to demonstrate that the DNA, not the protein, was the genetic material that was transferred to the bacteria during infection.

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  • 8. 

    Frederick Griffith performed four experiments using Streptococcus pneumoniae on mice. Which experiment killed the mice?

    • A.

      Injected mouse with live R cells

    • B.

      Inject mouse with live S cells

    • C.

      Kill S cell with heat

    • D.

      Kill S cells with heat and mixed with live S cells

    • E.

      Kill S cells with heat and mixed with live F cells

    Correct Answer
    B. Inject mouse with live S cells
    Explanation
    In the given experiments, Frederick Griffith injected mice with different types of cells. The S cells are known to be virulent and can cause disease, while the R cells are non-virulent. The experiment that resulted in the death of the mice is when live S cells were injected. This is because the live S cells are capable of causing an infection and leading to the death of the mice.

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  • 9. 

    Frederick Griffith concluded after his experiments on laboratory mice.  This factor killed the Streptococcus pneumoniae.

    • A.

      Strong and healthy mice

    • B.

      Heat

    • C.

      Room temperature

    • D.

      Poor health mice

    Correct Answer
    B. Heat
    Explanation
    The correct answer is "Heat" because Frederick Griffith concluded that the factor responsible for killing the Streptococcus pneumoniae bacteria in his experiments was heat. This implies that heat had a detrimental effect on the bacteria, causing their death.

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  • 10. 

    Bacteriophages contain DNA labeled with radioactive sulfur-35.

    • A.

      True

    • B.

      False

    Correct Answer
    B. False
    Explanation
    Bacteriophages do not contain DNA labeled with radioactive sulfur-35. Bacteriophages are viruses that infect bacteria, and their genetic material can be either DNA or RNA. Radioactive labeling is a technique used to track molecules in experiments, but it is not a characteristic of bacteriophages. Therefore, the statement is false.

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  • Current Version
  • Mar 20, 2023
    Quiz Edited by
    ProProfs Editorial Team
  • Mar 16, 2012
    Quiz Created by
    John Mitchell

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