Cell Structures in Bacteria

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Questions and Answers

What is the primary role of the bacterial cell wall?

  • To facilitate nutrient absorption
  • To provide strong, flexible support (correct)
  • To assist in cell division
  • To store genetic material

What are the two major components of a gram-positive cell wall?

  • Phospholipids and sterols
  • Lipopolysaccharides and proteins
  • Cellulose and chitin
  • Peptidoglycan and teichoic acids (correct)

How do bacteria classify their cell walls?

  • By their ability to produce spores
  • By their color under a microscope
  • Based on the presence of peptidoglycan (correct)
  • According to their metabolic pathways

Which type of bacteria lack a cell wall?

<p>Mycoplasma bacteria (B)</p> Signup and view all the answers

Which additional components might be present in a gram-positive cell wall?

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

What is one of the primary functions of Haemophilus influenzae as indicated in the provided content?

<p>Inhibits killing by white blood cells (D)</p> Signup and view all the answers

What role does the capsule in the submucosa play regarding bacteria?

<p>It allows bacteria to evade phagocytosis. (D)</p> Signup and view all the answers

Which of the following best describes Haemophilus influenzae's impact on the immune response?

<p>It acts as a barrier to the immune response (A)</p> Signup and view all the answers

In the context of cellular interactions, what is a characteristic behavior of Haemophilus influenzae?

<p>Inhibits the activity of immune cells (C)</p> Signup and view all the answers

What does the presence of PMNs indicate in the immune system?

<p>An acute inflammatory response. (D)</p> Signup and view all the answers

Considering its interactions, what is a potential consequence of Haemophilus influenzae's ability to inhibit white blood cells?

<p>Increased susceptibility to infections (A)</p> Signup and view all the answers

What role does Haemophilus influenzae play in the context of disease?

<p>It can act as an opportunistic pathogen that evades immune detection (C)</p> Signup and view all the answers

What happens when bacteria enter the bloodstream?

<p>They can spread infection to other body parts. (D)</p> Signup and view all the answers

How does the capsule enhance bacterial survival?

<p>By preventing antibody binding. (C)</p> Signup and view all the answers

What is a likely consequence of bacteria evading phagocytosis through the capsule?

<p>Chronic infection development. (A)</p> Signup and view all the answers

What is the primary function of the movement described in the content?

<p>To push the cell forward and provide motility (C)</p> Signup and view all the answers

Which component of the structure is described as a curved sheath?

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

What characterizes the filament of this movement structure?

<p>Thin and helical structure composed of proteins (A)</p> Signup and view all the answers

Which part of the movement structure is not mentioned in the provided content?

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

How many main parts are outlined for the movement structure?

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

What is the primary role of water in cell functions?

<p>It acts as a solvent for materials used in cell functions. (C)</p> Signup and view all the answers

What defines a chromosome in a cell?

<p>It is a single, circular, double-stranded DNA molecule containing genetic information. (A)</p> Signup and view all the answers

Which statement about chromosomes is accurate?

<p>A chromosome is a double-stranded molecule that is circular in shape. (D)</p> Signup and view all the answers

Why is the solubility of materials in water important for cell functions?

<p>It ensures materials can be transported within the cell. (B)</p> Signup and view all the answers

What percentage of a cell's composition is typically made up of water?

<p>70-80% (B)</p> Signup and view all the answers

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Study Notes

Cell Wall

  • Provides strong, flexible support
  • Prevents the cell wall from bursting or collapsing due to changes in osmotic pressure
  • Used to classify bacteria
  • Gram-positive cell wall
    • Consists of two main parts: peptidoglycan and teichoic acids
    • Includes additional carbohydrates and proteins, depending on the species
  • Gram-negative cell wall
    • Distinct from Gram-positive cell walls
    • Contains an outer membrane outside the peptidoglycan layer
  • Bacteria without cell walls
    • Mycoplasma
    • Unique group

Flagella

  • Motility structure in some bacteria
  • Composed of three sections:
    • Filament: Long, thin, helical structure composed of proteins
    • Hook: Curved sheath
    • Basal body: Anchors the flagellum to the cell wall and cell membrane
  • May be located at one or both poles, or all over the cell surface

Capsule

  • External to the cell wall
  • Can be used for identification
  • Composed of polysaccharides
  • Functions:
    • Attachment
    • Inhibits killing by white blood cells (WBCs)
    • Helps bacteria evade phagocytosis
    • Allows entry into bloodstream

Cytoplasm

  • The cell's internal environment
  • Contains 70-80% water
  • Acts as a solvent for materials involved in all cell functions

Chromosome

  • Single, circular, double-stranded DNA molecule
  • Contains all the genetic information required by a cell
  • Key difference from eukaryotic cells

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