Block B Flashcards
What is the defining feature of G- bacteria
The peptidoglycan layer is much thinner in G- than in G+
In G- bacteria, what is fimbriae and the flagella used for
adhesion and motility, respectively
What secretion system is a key virulence factor for many G- bacteria
type III
Name 3 characteristics of a G- outer membrane
-protects cells from bile salts and other detergents such a SDS
-bilayer is asymmetric and consists of two types of lipid: phospholipids and LPS
-excludes large antibiotics but small antibiotics can diffuse through protein channels
What is the relevence of G- bacteria in terms of antibiotic resistance
G- bacteria makes up the majority of antimicrobial resistance worldwide
____ is the most metabollically diverse of all bacteria
proteobacteria
How does Rickettsiales infect mammalian hosts
through arthropod bites (ticks, fleas, lice etc) or feces
What age group does Neisseria meningitidis usually effect
infants, teens and young adults
Why is Neisseria gonorrhoeae a major health concern
there is a spread of highly drug-resistant strains
What bacteria produces Perussis, aka whooping cough
Bordetella pertussis
What does Enterobacteriales do?
ferments sugars to a variety of end products
Describe the pathigonesis of Campylobacter jejuni
causes foodborne illness, bloody diarrhea, fever, found in undercooked meat and fish
What is a biofilm
it is when bacterial cells adhere to each other and to a surface and are enclosed in an adhesive matrix
What is a adhesive matrix usually made out of
polysaccharides
Why do bacteria form biofilms (4 marks)
self defense, allow cells to remain in favorable niche, traps nutrients for microbial growth, allows bacterial cells to live in close association with each other
