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