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L4 Structure of Prokaryotes

Mer Scott 12 preguntas 5,0 (1 valoración)

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Preguntas del test (12)

  1. 1Which statement about bacterial structure is INCORRECT?
    1. ABacteria have cell walls.
    2. BBacteria have a nucleus.
    3. CBacteria can have flagella for motility.
    4. DBacteria have ribosomes.
  2. 2Select the INCORRECT statement about peptidoglycan.
    1. APeptidoglycan is the target of antibiotics.
    2. BOnly bacterial cell walls contain peptidoglycan.
    3. CAll bacterial cells have an equal amount of peptidoglycan in their cell wall.
  3. 3Which of the following is statements about the bacterial cell wall is NOT correct?
    1. AIt is a rigid macromolecular layer which provides strength to the cell.
    2. BIt confers cell shape and protects cell from lysing via osmosis.
    3. CIt has pores to allow transport of macromolecules.
  4. 4Gram-positive bacteria have a [blank_start]simple, thick[blank_end] layer of peptidoglycan as their cell wall, which retains the [blank_start]crystal violet[blank_end] Gram stain even when washed with alcohol. Gram-negative bacteria have a [blank_start]complex[blank_end] cell wall with a [blank_start]thin[blank_end] layer of peptidoglycan, therefore the gram stain can be washed out with alcohol and the [blank_start]safranin[blank_end] dyes the cells [blank_start]pink[blank_end].
    1. Asimple, thick
    2. Bcomplex, thin
    3. Ccrystal violet
    4. Dsafranin (pink)
    5. Ecomplex
    6. Fsimple
    7. Gthin
    8. Hthick
    9. Isafranin
    10. Jgram stain
    11. Kpink
    12. Lorange
  5. 5Choose the INCORRECT statement about bacterial flagella.
    1. AFlagella act as a propeller.
    2. BFlagella have 3 structures: the long filament, the flexible 'hook', and the rigid basal body.
    3. CThe 'running' motion of bacteria is due to the clockwise rotation of the flagella.
    4. DFlagella give bacteria motility and allow them to move at high speeds, and change direction.
  6. 6Which statements about bacterial movement are true?
    1. ABacteria rotate the flagellum CCW to 'run' and CW to stop and rotate/turn.
    2. BRandom movement promotes a higher chance of finding nutrients.
    3. CBacteria only exhibit positive chemotaxis.
    4. DBacteria are too small to sense a spatial gradient, and must detect gradients by moving over time (temporal gradient).
  7. 7Which of the following statements about bacterial fimbriae/pili are CORRECT?
    1. AThey allow bacteria to adhere to surfaces.
    2. BThey play a role in bacterial motility.
    3. CFimbriae/pili have proteins called adhesins which bind to specific receptors on cell surfaces.
    4. DAll bacteria have fimbriae/pili.
  8. 8Which statement about bacterial capsid layers are INCORRECT?
    1. AAll capsid layers are made of glycocalyx, which forms a sticky mesh of fibres.
    2. BIf the layer is disorganised and loosely attached to the cell wall, it is called a slime layer.
    3. CIf the layer is organised and firmly attached to the cell wall, it is called a capsule.
    4. DCapsules can provide nutrients, protection from antibodies, and prevent cell desiccation.
    5. EGram-negative bacteria do not have capsules.
  9. 9Which of these statements about endospores are CORRECT?
    1. AEndospores are very heat resistant, but not very chemical resistant.
    2. BOnly some gram-positive bacteria can produce endospores.
    3. CThe trigger for making endospores is a certain stage of the bacteria's life cycle.
    4. DEndospores can last up to 50 million years in their dormant state.
  10. 10Which of these is NOT a type of endospore?
    1. ATerminal
    2. BSub-terminal
    3. CCentral
    4. DSub-central

Información

Descripción
Objectives: describe the basic function of the components found in prokaryotes and the unique features found only in prokaryotes, and identify the key characteristcs that distinguish Gram-positive and Gram-negative bacteria.
Idioma
English
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