Bacterial Structure and Function: Shape, Arrangement, and Size
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Questions and Answers

Which type of microorganism can live within soil, in the ocean, and inside the human gut?

  • Algae
  • Archaea
  • Bacteria (correct)
  • Viruses
  • Which of the following organisms is characterized by DNA in a double-stranded loop and a complex peptidoglycan-protein cell wall?

  • Archaea
  • Bacteria (correct)
  • Viruses
  • Algae
  • What is the main characteristic of fungi?

  • Presence of mitochondria
  • Rigid cell walls and true nucleus (correct)
  • Motility
  • Photosynthetic pigments
  • What is the role of some bacteria in relation to human digestion?

    <p>Curdling milk into yogurt (B)</p> Signup and view all the answers

    Which microorganism is known for being heterotrophic and causing most infections as a result of weakened host immune defenses?

    <p>Fungi (A)</p> Signup and view all the answers

    What is a distinctive characteristic of bacteria's ribosomes?

    <p>Small ribosomes free in the cytoplasm (D)</p> Signup and view all the answers

    Which of the following is a characteristic of fungi?

    <p>Reproduce both sexually and asexually (A)</p> Signup and view all the answers

    What is a living characteristic of viruses?

    <p>Reproduce at a fantastic rate in living host cells (C)</p> Signup and view all the answers

    What is the main method of growth for most microalgae?

    <p>Autotrophic growth through photosynthesis (B)</p> Signup and view all the answers

    What determines the pathogenicity of microorganisms?

    <p>The nature and type of virulence factors (D)</p> Signup and view all the answers

    What differentiates Gram-positive and Gram-negative bacteria based on cell wall structure?

    <p>Peptidoglycan thickness and teichoic acids (B)</p> Signup and view all the answers

    Which of the following is a characteristic of protozoa?

    <p>Transmission by arthropods (A)</p> Signup and view all the answers

    What is the main characteristic of most fungi?

    <p>Rigid cell wall surrounding the protoplasm (D)</p> Signup and view all the answers

    What are the characteristics of the cell wall of Gram-positive bacteria?

    <p>Composed mainly of peptidoglycan and teichoic acids (C)</p> Signup and view all the answers

    What is the average diameter of cocci bacteria?

    <p>0.75 µm (B)</p> Signup and view all the answers

    What is a distinguishing feature of viruses in terms of metabolism?

    <p>Lack of metabolism on their own (D)</p> Signup and view all the answers

    What are flagella made up of?

    <p>Flagellin proteins (A)</p> Signup and view all the answers

    What is the function of pili in bacteria?

    <p>Adhering bacteria to surfaces (B)</p> Signup and view all the answers

    How are flagellated bacteria described based on the arrangement of flagella?

    <p>Monotrichous (D)</p> Signup and view all the answers

    What is the function of the capsule in most bacteria?

    <p>Protection (A)</p> Signup and view all the answers

    What is the range of length for bacilli bacteria?

    <p>2-10 µm (A)</p> Signup and view all the answers

    What is the main function of the bacterial cell wall?

    <p>Protection against phagocytic engulfment (C)</p> Signup and view all the answers

    What is the composition of the Gram-positive bacterial cell wall?

    <p>Plasma membrane, peptidoglycan, and capsule (A)</p> Signup and view all the answers

    What connects the peptidoglycan to the outer membrane in Gram-negative bacteria?

    <p>Lipoprotein layer (D)</p> Signup and view all the answers

    What is the main function of plasma membranes in bacteria?

    <p>Selective permeability (B)</p> Signup and view all the answers

    What is the role of the tangle of double-stranded DNA in prokaryotes?

    <p>Protein production (D)</p> Signup and view all the answers

    What are plasmids in bacteria primarily known for?

    <p>Antibiotic resistance (C)</p> Signup and view all the answers

    What determines the rigidity and shape of the bacterial cell wall?

    <p>Peptidoglycan (C)</p> Signup and view all the answers

    What is the primary function of the outer membrane in Gram-negative bacteria?

    <p>Selective permeability (A)</p> Signup and view all the answers

    What are teichoic acids made of?

    <p>Polymers of glycerol and ribitol phosphates (D)</p> Signup and view all the answers

    What is the main role of plasmids in bacteria?

    <p>Facilitation of genetic engineering (A)</p> Signup and view all the answers

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