Colony Communication

Question 1

What do the HCD genes expressed by the the gram -ve P.aeruginosa do?

Accepted Answer

Allow biofilm formation

Answer

Increase pathogenicity

Answer

Cause a fibrin clot barrier

Question 2

At HCD, P.aeruginosa produced which Homoserine Lactone?

Accepted Answer

LasI, which are detected by LasR

Accepted Answer

RhlI which are detected by RhlR

Answer

Mrl, which are detected by MrR

Answer

FasI, which are detected by FasR

Question 3

The homoserine lactones of P. aeruginosa can be detected in the sputum of Cystic fibrosis patients

Answer

true

Question 4

The strains of S.aureus produce 1 of 4 peptides

Answer

true

Question 5

What is the role of each peptide produced by S.aureus?

Accepted Answer

Stimulates other strains that produce the same peptide

Accepted Answer

Inhibits other strains that produce different peptides

Answer

Inhibits other strains that produce the same peptide

Answer

Stimulates other strains that produce different peptides

Question 6

P2 & P3 are divergent promoters (they go in opposite directions)

Answer

true

Question 7

In E.Coli, of the P3 stimulated proteins, AgrA is the intracellular transducer,....

Accepted Answer

AgrB is the exit channel, AgrD is the autoinducer, AgrC is the receptor

Answer

AgrV is the exit channel, AgrC is the autoinducer, AgrD is the receptor

Question 8

P2 transcribes RNAIII

Answer

true

Question 9

RNAIII controls 100s of genes

Answer

true

Question 10

RNAIII binds to the mRNA close to the ribosomal binding site, and does what?

Accepted Answer

Alters the super- secondary structure to inhibit/promote ribosomal binding

Answer

Alters the secondary structure to inhibit/promote ribosomal binding

Answer

Alters the tertiary structure to inhibit/promote ribosomal binding

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