Microbiology 1.Adhesin proteins help bacteria A. avoid phagocytosis B. attach to
ID: 267025 • Letter: M
Question
Microbiology
1.Adhesin proteins help bacteria
A. avoid phagocytosis
B. attach to specific receptors in host cells
C. move into deeper tissue
D. attach to bacteriophages
2. Match the bacterial response with the immune system mechanism it overides.
1. Host transferrins in blood capture iron making it unavailable for microorganisms
2 .IgA proteases in body fluids bind to bacterial pili, preventing adherance
3. Specific IgA antibodies bind to specific protein receptors on the surface of bacterial cell, preventing adherance.of bacteria to host cell
4. IgA's is present in body fluids found in mucous membranes, like saliva, and sweat.
A. As bacteria divide and increase their numbers, some will change the amino acid sequence of their protein receptors to prevent antibody binding to receptors.
B. Some bacteria secrete siderophores which are very effectively at binding available iron,
C.Pili bound by antibody is shed by the bacterial cell, which then makes new non-antibody bound pili
D. Some bacteria that colonizes mucous membranes secretes IgA proteases, enzymes that can destroy IgA found in the fluids of mucous membrane.
3. Type III secretion systems force host cell to take in bacterial cell
A. True
B. False
4. Which is a mechanism use by intracellular Shygella bacteria to travel from inside of host cell to other host cells
A. type III secretion systems
B. phagocytosis
C. transcytosis
D. apoptosis
5. Serum resistant gram negative bacteria can
A. use transcytosis to travel from cell to cell
B. avoid lysis by MAC's
D. A, B, and C
E. B and C
6. Match the bacterial mechanism to avoid host phagocytosis with its description
1. C5a peptidases
2. leukocydins
3. M protein, and capsules
4. Fc receptors
A. Destroy proteins that attract phagocytes to the ares of infection
B.prevent opsonization by antibodies
C. kill phagocytes
D.deactivation of C3b, which prevents opsonization
7. Protein G
A. deactivates C3b
B.prevents opsonization by complement
C. prevents opsonization by antibodies
D.A and C
E. B and C
1. A mechanism that allows cells to survive phagocytosis involves escaping the lysosome
A. True
B. False
Explanation / Answer
1. B, adhesin protein help in attachment to bacterial cell to attach with specific receptors on host cell.
2. Matches are as
1 . B.
2 . C. .
3. A.
4. D
3. True, the protein secreted by bacterial cell modify host cell in such a way that it promotes bacterial engulfment.
4. It uses TS III system for translocation.