Bacterial Growth and Oxygen Requirements
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Questions and Answers

Which category of microorganisms is completely dependent on the cells they infect?

  • Viruses (correct)
  • Fungi
  • Bacteria
  • Parasites
  • Which microorganisms can be further categorized based on staining of cell wall, shape, oxygen requirements, and ability to form spores?

  • Parasites
  • Bacteria (correct)
  • Fungi
  • Viruses
  • Which type of fungi have threadlike tubular structures and specialized asexual reproductive forms?

  • Single-celled organisms (yeasts)
  • Multi-celled organisms (molds) (correct)
  • Dimorphic fungi
  • None of the above
  • Which category of microorganisms are eukaryotes?

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

    Which category of microorganisms can be subdivided into DNA or RNA viruses, but never both?

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

    Which category of microorganisms have properties such as presence or absence of an envelope or shape/size that can lead to further classification?

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

    During which phase of bacterial growth does cell division occur rapidly?

    <p>Logarithmic phase</p> Signup and view all the answers

    Which type of bacterial metabolism is characterized by utilizing an inorganic molecule other than oxygen as the final hydrogen acceptor?

    <p>Anaerobic metabolism</p> Signup and view all the answers

    What characteristic differentiates the termination sites of bacterial mRNA transcripts?

    <p>Presence of stem loop structure</p> Signup and view all the answers

    What is the role of sigma factor in bacterial gene expression?

    <p>Switching on sets of genes for transcription initiation</p> Signup and view all the answers

    Which genetic element is capable of independently moving within a cell and between cells through horizontal gene transfer?

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

    What is the function of an initiator tRNA molecule in bacterial translation?

    <p>Carries formylmethione</p> Signup and view all the answers

    Which type of infectious disease can occur when the normal flora get displaced?

    <p>Endogenous infection</p> Signup and view all the answers

    What is the characteristic cellular organization of prokaryotic organisms?

    <p>Unicellular and lack nuclear membrane, mitochondria, Golgi bodies, or ER</p> Signup and view all the answers

    What are the bacterial ribosomes characterized as?

    <p>70S</p> Signup and view all the answers

    Where does genomic replication begin in bacteria?

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

    Which enzyme is responsible for initiating unwinding and separation of the two DNA strands during genomic replication in bacteria?

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

    What is responsible for cellular arrangements of bacteria morphology?

    <p>Cell division</p> Signup and view all the answers

    Which genetic element can carry toxin genes like Diphtheria toxin?

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

    What type of transfer involves the uptake of naked DNA fragments by bacterial cells?

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

    Which bacterial classification is based on the stain retention ability of the cell wall?

    <p>Peptidoglycan classification</p> Signup and view all the answers

    What is the main structural component of the cell wall in bacteria?

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

    Which bacterial species have no peptidoglycan in their cell wall?

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

    What do we call the ability of a bacterium to cause damage to the host?

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

    Which bacterial virulence factor is made of high molecular weight polysaccharides and provides protection against phagocytosis by host cells?

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

    What is the main function of pili (fimbriae) in bacteria?

    <p>Attachment to host cells</p> Signup and view all the answers

    Which bacterial virulence factor is negatively regulated by the presence of free iron in the growth environment?

    <p>Diphtheria toxin</p> Signup and view all the answers

    What is the main role of flagella in bacteria?

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

    Which bacterial virulence factor is composed of Lipid A, core polysaccharide, and an O antigen, and is a powerful stimulator of innate and adaptive immune responses?

    <p>Lipopolysaccharide (LPS)</p> Signup and view all the answers

    What is the function of biofilm as a bacterial virulence factor?

    <p>Protecting bacteria from antibiotics and host immune defenses</p> Signup and view all the answers

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