The Germ Theory of Disease and Lazzaro Spallanzani
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Questions and Answers

Who was the first person to observe and describe microorganisms accurately?

  • Goerg Friedrich Schroder
  • Theodore Schwann
  • Needham
  • Lazzaro Spallanzani (correct)
  • What did Goerg Friedrich Schroder and Theodore von Dusch observe when air passed through sterile cotton wool in a flask of heat-sterilized medium?

  • Growth took place
  • No growth occurred (correct)
  • Bacteria increased
  • Heat sterilized the medium
  • Which concept states that living cells can only rise from preexisting living cells?

  • Biogenesis (correct)
  • The Germ Theory of Disease
  • Spontaneous generation
  • Tyndallization
  • Who showed that dust carries germs which contaminate sterile broth?

    <p>John Tyndall</p> Signup and view all the answers

    What did Theodore Schwann observe in a flask containing nutrient solution after air passed through a red-hot tube?

    <p>No growth occurred</p> Signup and view all the answers

    What is the method of sterilization for three consecutive days known as, demonstrated by John Tyndall?

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

    What is the function of the plasma membrane in prokaryotic cells?

    <p>Act as an osmotic barrier and generate chemical energy</p> Signup and view all the answers

    Which type of cell has a gram-positive cell wall structure?

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

    What is the primary mode of reproduction in prokaryotic cells with high disruption, resistance to lysozyme, and inhibition by basic dye?

    <p>Binary fission</p> Signup and view all the answers

    Which prokaryotes lack a cell wall and instead contain sterols in their cell membrane?

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

    What is the function of ribosomes in prokaryotic cells?

    <p>Give the cytoplasm a granular structure</p> Signup and view all the answers

    Which layer of prokaryotic cells consists of a phospholipid bilayer and functions as an osmotic barrier?

    <p>Plasma Membrane</p> Signup and view all the answers

    What is the primary function of Beta-Lactamase?

    <p>Destroy the Beta-Lactam ring</p> Signup and view all the answers

    Which antibiotic acts by inhibiting transpeptidase?

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

    What role do penicillin binding proteins (PBPs) play in the presence of Beta-Lactam antibiotics?

    <p>Mediate peptidoglycan crosslinking</p> Signup and view all the answers

    What is the significance of having a high therapeutic index for a chemotherapeutic agent?

    <p>It makes the antibiotic more selective</p> Signup and view all the answers

    Which molecule is involved in the synthesis of tetrahydrofolic acid (THFA)?

    <p>PABA – p-aminobenzoic acid</p> Signup and view all the answers

    Which biosafety cabinet class provides the highest level of safety to the worker?

    <p>Class III</p> Signup and view all the answers

    What type of agents are handled in a Class III biosafety cabinet?

    <p>BSL 4 agents</p> Signup and view all the answers

    Which biosafety cabinet type is known as Laminar flow BSC?

    <p>Class II</p> Signup and view all the answers

    Which type of biosafety cabinet has a fixed opening with 70% of the air recirculated?

    <p>Class IIA</p> Signup and view all the answers

    What is the main function of a Class IIB biosafety cabinet?

    <p>Used for chemicals and carcinogens</p> Signup and view all the answers

    Which level of biological agents has no known potential for infecting healthy people?

    <p>Level 1</p> Signup and view all the answers

    Which type of cells contain many membrane-bound organelles such as nucleus, endoplasmic reticulum, and mitochondria?

    <p>Plant cells</p> Signup and view all the answers

    What is a characteristic feature of eukaryotic cells that distinguishes them from prokaryotic cells?

    <p>Presence of membrane-bound organelles</p> Signup and view all the answers

    Which organelle is commonly found in eukaryotic cells but usually absent in prokaryotic cells?

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

    What is a key difference between the genetic material of prokaryotes and eukaryotes?

    <p>Absence of true nucleus in prokaryotes</p> Signup and view all the answers

    Which type of cell division is primarily associated with prokaryotic cells?

    <p>Binary fission</p> Signup and view all the answers

    What is the significance of the existence of gas vesicles in prokaryotic cells?

    <p>Regulation of buoyancy and movement</p> Signup and view all the answers

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