UCO: MICROBIOLOGY EXAM 4-JONES | QUESTIONS
AND ANSWERS | SOLVED 100% CORRECT.
The removal of plasmids reduces virulence in which of the following
organisms? Answer - Streptococcus mutans
What is the LD50 for the bacterial toxin tested in the example below? Answer -
25
Which of the following is not a portal of entry for pathogens? Answer - Blood
All of the following can occur during bacterial infection. Which would prevent
all of the other? Answer - vaccination against fimbriae
The ID50 for Campylobacter sp. is 500 cells; the ID50 for Crytosporidium sp. is
100 cells. Which of the following statements is false? Answer - Crytosporidium
is more virulent than Campylobacter
An encapsulated bacterium can be virulent because the capsule Answer - resits
phagocytosis
A drug that binds to mannose on human cells would prevent Answer - the
attachment of pathogenic E.coli
, The earliest smallpox vaccines were infected tissue rubbed into the skin of a
healthy person. The recipient of such a vaccine usually developed a mild case
of smallpox, recovered, and was immune thereafter. What is the most likely
reason this vaccine did not kill more people? Answer - Skin is the wrong portal
of entry for smallpox
Which of the following does not represent the same mechanism for avoiding
host defense as the others? Answer - surface protein genes in Neisseria
gonorrhoeae mutate frequently
Which of the following statements is true? Answer - A successful pathogen
doesn't kill its host before it is transmitted.
Legionella uses C3b receptors to enter monocytes. This____? Answer -
prevents phagocytosis
Chlamydia can prevent the formation of phagolysosomes and therefore can?
Answer - avoid being digested
If the following are placed in the order of occurrence, which would be the third
step? Answer - formation of a phagosome
If the following are placed in the order of occurrence, which would be the third
step? Answer - activation of C3
A human host can prevent a pathogen from getting enough iron by all of the
following except? Answer - binding iron with siderophores
A decrease in the production of C3 would result in? Answer - increase
susceptibility to an illness
AND ANSWERS | SOLVED 100% CORRECT.
The removal of plasmids reduces virulence in which of the following
organisms? Answer - Streptococcus mutans
What is the LD50 for the bacterial toxin tested in the example below? Answer -
25
Which of the following is not a portal of entry for pathogens? Answer - Blood
All of the following can occur during bacterial infection. Which would prevent
all of the other? Answer - vaccination against fimbriae
The ID50 for Campylobacter sp. is 500 cells; the ID50 for Crytosporidium sp. is
100 cells. Which of the following statements is false? Answer - Crytosporidium
is more virulent than Campylobacter
An encapsulated bacterium can be virulent because the capsule Answer - resits
phagocytosis
A drug that binds to mannose on human cells would prevent Answer - the
attachment of pathogenic E.coli
, The earliest smallpox vaccines were infected tissue rubbed into the skin of a
healthy person. The recipient of such a vaccine usually developed a mild case
of smallpox, recovered, and was immune thereafter. What is the most likely
reason this vaccine did not kill more people? Answer - Skin is the wrong portal
of entry for smallpox
Which of the following does not represent the same mechanism for avoiding
host defense as the others? Answer - surface protein genes in Neisseria
gonorrhoeae mutate frequently
Which of the following statements is true? Answer - A successful pathogen
doesn't kill its host before it is transmitted.
Legionella uses C3b receptors to enter monocytes. This____? Answer -
prevents phagocytosis
Chlamydia can prevent the formation of phagolysosomes and therefore can?
Answer - avoid being digested
If the following are placed in the order of occurrence, which would be the third
step? Answer - formation of a phagosome
If the following are placed in the order of occurrence, which would be the third
step? Answer - activation of C3
A human host can prevent a pathogen from getting enough iron by all of the
following except? Answer - binding iron with siderophores
A decrease in the production of C3 would result in? Answer - increase
susceptibility to an illness
