8276263
Descripción
Pregunta 1
Pregunta
Which statement about bacterial structure is INCORRECT?
Respuesta
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Bacteria have cell walls.
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Bacteria have a nucleus.
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Bacteria can have flagella for motility.
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Bacteria have ribosomes.
Pregunta 2
Pregunta
Select the INCORRECT statement about peptidoglycan.
Respuesta
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Peptidoglycan is the target of antibiotics.
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Only bacterial cell walls contain peptidoglycan.
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All bacterial cells have an equal amount of peptidoglycan in their cell wall.
Pregunta 3
Pregunta
Which of the following is statements about the bacterial cell wall is NOT correct?
Respuesta
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It is a rigid macromolecular layer which provides strength to the cell.
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It confers cell shape and protects cell from lysing via osmosis.
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It has pores to allow transport of macromolecules.
Pregunta 4
Pregunta
Gram-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].
Respuesta
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simple, thick
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complex, thin
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crystal violet
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safranin (pink)
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complex
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simple
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thin
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thick
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safranin
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gram stain
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pink
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orange
Pregunta 5
Pregunta
Choose the INCORRECT statement about bacterial flagella.
Respuesta
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Flagella act as a propeller.
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Flagella have 3 structures: the long filament, the flexible 'hook', and the rigid basal body.
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The 'running' motion of bacteria is due to the clockwise rotation of the flagella.
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Flagella give bacteria motility and allow them to move at high speeds, and change direction.
Pregunta 6
Pregunta
Which statements about bacterial movement are true?
Respuesta
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Bacteria rotate the flagellum CCW to 'run' and CW to stop and rotate/turn.
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Random movement promotes a higher chance of finding nutrients.
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Bacteria only exhibit positive chemotaxis.
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Bacteria are too small to sense a spatial gradient, and must detect gradients by moving over time (temporal gradient).
Pregunta 7
Pregunta
Which of the following statements about bacterial fimbriae/pili are CORRECT?
Respuesta
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They allow bacteria to adhere to surfaces.
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They play a role in bacterial motility.
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Fimbriae/pili have proteins called adhesins which bind to specific receptors on cell surfaces.
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All bacteria have fimbriae/pili.
Pregunta 8
Pregunta
Which statement about bacterial capsid layers are INCORRECT?
Respuesta
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All capsid layers are made of glycocalyx, which forms a sticky mesh of fibres.
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If the layer is disorganised and loosely attached to the cell wall, it is called a slime layer.
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If the layer is organised and firmly attached to the cell wall, it is called a capsule.
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Capsules can provide nutrients, protection from antibodies, and prevent cell desiccation.
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Gram-negative bacteria do not have capsules.
Pregunta 9
Pregunta
Which of these statements about endospores are CORRECT?
Respuesta
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Endospores are very heat resistant, but not very chemical resistant.
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Only some gram-positive bacteria can produce endospores.
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The trigger for making endospores is a certain stage of the bacteria's life cycle.
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Endospores can last up to 50 million years in their dormant state.
Pregunta 10
Pregunta
Which of these is NOT a type of endospore?
Respuesta
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Terminal
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Sub-terminal
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Central
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Sub-central
Pregunta 11
Pregunta
Which of these is NOT a specific property of endospores?
Respuesta
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Low water content
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High Ca2+ concentration
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Many layers not present in the typical vegetative cell
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Low metabolic activity
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No diplicolinic acid
Pregunta 12
Pregunta
Prokaryotic cells are [blank_start]small and unicellular[blank_end]. They have [blank_start]no[blank_end] endomembrane system [blank_start]or[blank_end] cytoskeleton, their DNA is [blank_start]circular[blank_end], and they reproduce via [blank_start]binary fission[blank_end].
Eukaryotic cells are larger and often multicellular. They have [blank_start]an[blank_end] endomembrane system (e.g. nucleus, ER, Golgi, etc) and a cytoskeleton. Their DNA is [blank_start]linear[blank_end] and they reproduce via meiosis and mitosis.
Respuesta
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small and unicellular
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no
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an
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or
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and
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circular
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linear
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binary fission
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