Studied by 0 people
Chapters 4 and 6
Which component is unique to Gram-negative bacteria?
a) teichoic acids
b) thick peptidoglycan layer
c) lipopolysaccharides (LPS)
d) large pores in peptidoglycan matrix
C
What is the function of teichoic acids in Gram-positive bacteria?
a) transport molecules across the membrane
b) stabilize the outer membrane
c) provide structural support in peptidoglycan
d) act as endotoxins
C
What part of the flagellum acts as an anchor within the cell?
a) filament
b) hook
c) basal body
d) stator
C
Which type of motility is characterized by smooth gliding over surfaces?
a) flagellar motility
b) twitching motility
c) actin polymerization
d) gliding motility
D
What is the function of bacterial endospores?
a) nutrient absorption
b) resistance to harsh environment conditions
c) energy production
d) DNA replication
B
Which bacterial movement mechanism is used by Shigella dysenteriae?
a) flagellar rotation
b) twitching motility
c) actin polymerization
d) porin transport
C
What is the primary role of TonB proteins in Gram-negative bacteria?
a) energy production
b) transport of molecules into the periplasmic space
c) biofilm formation
d) endospore germination
B
What differentiates a capsule from the slime layer?a) capsules are loosely attached, while slime layers are rigid
b) capsules are organized and difficult to remove, while slime layers are unorganized and easily removed
c) slime layers are composed of proteins, while capsules contains polysaccharides
d) capsules promote motility, while slime layers do not
B
Which of the following structures aid in bacterial conjugation?
a) flagella
b) pili
c) glycocalyx
d) S layer
B
What triggers the process of sporulation in bacteria?
a) heat exposure
b) lack of nutrients
c) presence of oxygen
d) antibiotic exposure
B
What is the function of porins in Gram-negative bacteria?
a) transport large molecules across the plasma membrane
b) increase the permeability of the outer membrane
c) attach bacteria to host surfaces
d) acts as a source of energy
B
What structure is responsible for bacterial adhesion to surfaces?
a) S layer
b) capsule
c) flagellum
d) TonB protein
B
What determines the shape and rigidity of bacteria?
a) plasma membrane
b) peptidoglycan layer
c) lipopolysaccharides
d) pili
B
