A221 Team 4 Lesson 8

How does A.Fischeri help the Bobtail squid?

• It doesnt help

• It helps to hide it from predators.

• It protects it from prey.

• For protection from predators and hide from prey.

Answer explanation

Aliivibrio fischeri is a bioluminescent marine bacterium. Bobtail squid is protected from its predators and is able to hide well from its prey.

What is the symbiotic relationship between A.Fischeri bacteria and the Bobtail squid?

• Mutualism

• Commensalism

• Parasitism

What is the cell arrangement of A.Fischeri?

• It looks like a fish

• Coccus

• Vibrio

• Bacillus

Communication cannot occur between Gram-positive and Gram-negative bacteria.

• True

• False

What is the difference in communcation between Gram-positive and Gram-negative bacteria?

• AHL

• Type of autoinducers

• SHL

• AIP

Both Gram-negative and Gram-positive use both regulatory and sensory proteins in the quorum sensing.

• True

• False

Quorum sensing such as bioluminescence can only occur in high cell density.

• True

• False

Which gene is involved in producing the bioluminescence effect?

• Lac operon

• Bacterial gene

• Trisomy 21

• Luciferase gene

How many phases are involved in biofilm formation?

• 0

• 2

• 5

• 4

What is the 3rd stage of biofilm formation and function?

• Maturation I - Fully mature biofilm acts as protective coating and barrier

• Maturation I - Arrival of other cells and polysaccharide matrix forms.

• Dispersion - Colonise new surfaces by dispersing single dividing cells.

• Initial attachment - Biofilm formation