Chapter 6 And 7

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Staysea993
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Quizzes Created: 1 | Total Attempts: 157
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  • 1/8 Questions

    _____ must be probvided to an organism.

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About This Quiz

Quiz on Chapter 6: Viruses
and on
Chapter 7: Elements of micobial nutrition, ecology and growth

Microbiology Quizzes & Trivia

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  • 2. 

    ________, a kind of chemoautotroph, produce methane gas under anaerobic conditions.

    Explanation
    Methanogens are a type of chemoautotroph that can produce methane gas in the absence of oxygen. Chemoautotrophs are organisms that obtain energy by oxidizing inorganic compounds, such as hydrogen gas, and use this energy to convert carbon dioxide into organic molecules. Methanogens are unique in their ability to produce methane as a byproduct of their metabolic processes. They are commonly found in environments such as swamps, marshes, and the digestive tracts of animals, where anaerobic conditions prevail. Methanogens play a crucial role in the global carbon cycle by contributing to the production of methane, a potent greenhouse gas.

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  • 3. 

    ______ are protein coats that enclose and protect their nucleic acid.

    Explanation
    Caspids are protein coats that enclose and protect their nucleic acid.

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  • 4. 

    96% of the cell is composed of these elements:-Carbon-Hydrogen-Oxygen-Phosphorous-Sulfur and

    • Magnesium

    • Potassium

    • Nitrogen

    • Zinc

    Correct Answer
    A. Nitrogen
    Explanation
    Nitrogen is the correct answer because it is one of the elements that make up 96% of the cell. The question states that the cell is composed of carbon, hydrogen, oxygen, phosphorous, sulfur, magnesium, potassium, nitrogen, and zinc. However, the other elements mentioned (magnesium, potassium, and zinc) are not part of the 96% composition, while nitrogen is included in the list of elements that make up the majority of the cell.

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  • 5. 

    Viruses bear no resemblance to cells?

    • True

    • False

    Correct Answer
    A. True
    Explanation
    Lack protein synthesizing machinery.

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  • 6. 

    Who postulated that rabies was caused by a Virus?

    • Antoni van Leeuwenhoek

    • Louis Pasteur

    • John Tyndall

    • Ferdinand Cohn

    Correct Answer
    A. Louis Pasteur
    Explanation
    Louis Pasteur is credited with postulating that rabies was caused by a virus. Pasteur conducted extensive research on rabies and made significant contributions to understanding the disease. He developed a vaccine for rabies and successfully tested it on animals, which led to the prevention and treatment of this deadly infection. Pasteur's work on rabies and other diseases laid the foundation for the field of microbiology and revolutionized our understanding of infectious diseases.

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  • 7. 

    Misfolded proteins, contain no nucleic acid.

    • Prions

    • Oncoviruses

    • Lysis

    • Capsid

    Correct Answer
    A. Prions
    Explanation
    Prions are misfolded proteins that do not contain nucleic acid. Unlike viruses, which have nucleic acid (DNA or RNA) surrounded by a protein coat called a capsid, prions consist solely of abnormal proteins. Prions are known to cause various neurodegenerative diseases, such as Creutzfeldt-Jakob disease and mad cow disease, by inducing other normal proteins to adopt the misfolded conformation. Therefore, prions are a unique class of infectious agents that can propagate without the need for genetic material.

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  • 8. 

    Chemoautotrophs (lithoautotrophs) survive totally on organic substances.

    • True

    • False

    Correct Answer
    A. False
    Explanation
    they survive on inorganic substances.

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  • Mar 20, 2023
    Quiz Edited by
    ProProfs Editorial Team
  • Dec 12, 2010
    Quiz Created by
    Staysea993
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