MCB Exam 3 Questions And Answers
Latest 2026 Update!!!
Which of the following processes usually results
in slightly varied seasonal influenza strains from Antigenic Drift
year to year?
Which stage of the HIV replication cycle allows
Integration
HIV to survive in a “latent” form?
Which enzyme allows HIV to generate a DNA
Reverse Transcriptase
copy of its RNA genome?
How was polio eradicated in the Americas by The US government investing a lot of money to
1980? develop vaccines and distribute them to people.
Unlike most other RNA viruses, Coronaviruses
Endoplasmic reticulum
assemble their virions at which host location?
Which of the following is NOT a symptom of
Fever
disease?
Which of the following is NOT a sign of disease? dizziness
Which of the following is NOT a predisposing
blister
factor of disease?
Which of the following is NOT a step that can be
See if vaccination with the causative pathogen
taken to establish case-and-effect relationship
protects against the disease.
between a pathogen and a lethal human illness?
Which of the following would make it extremely
difficult to satisfy all of Koch’s postulates for a The microbe cannot be isolated in pure culture.
particular microbe?
, A commensal E.coli strain usually found as part Delete the pil2 gene and test if the bacterium is
of the normal gut microbiota of chickens has a virulent in pigs, but not in chickens.
pilin gene (pil1) that is responsible for attaching
and colonizing chicken intestines but does not
cause disease. A clinical isolate of this E. coli
strain recently isolated from sick pigs still has pil
1 but now appears to also have a new pilin gene
(pil2). You think pil 2 is responsible for causing
infection in pigs.
How would you most directly test this
hypothesis?
A city has a population of 250,000 with 2,500
deaths per year from all causes. Of this
population, 10,000 have an incurable infectious
disease X. There are 1,000 new cases and 400 10,000/250,000
deaths each year from disease X.
The prevalence of disease X is .
According to this graph
of cases per capita in the
first few months of 2022,
which region in the
United States had the Northeast
lowest average of cases of
infection per capita
between February and
March?
A mosquito bites a person who then develops
fever and rash. What type of transmission would Biological vector transmission
this be?
Which of the following would be considered a A surface protein that allows the pathogen to
virulence factor of a pathogen? bind to the host cells.
Which of the following is not a characteristic Animal reservoirs are easier to eradicate than
associated with animal reservoirs? human reservoirs.
Carriers are dangerous because they exhibit all
They are symptomatic for infection
of the following, except.
Latest 2026 Update!!!
Which of the following processes usually results
in slightly varied seasonal influenza strains from Antigenic Drift
year to year?
Which stage of the HIV replication cycle allows
Integration
HIV to survive in a “latent” form?
Which enzyme allows HIV to generate a DNA
Reverse Transcriptase
copy of its RNA genome?
How was polio eradicated in the Americas by The US government investing a lot of money to
1980? develop vaccines and distribute them to people.
Unlike most other RNA viruses, Coronaviruses
Endoplasmic reticulum
assemble their virions at which host location?
Which of the following is NOT a symptom of
Fever
disease?
Which of the following is NOT a sign of disease? dizziness
Which of the following is NOT a predisposing
blister
factor of disease?
Which of the following is NOT a step that can be
See if vaccination with the causative pathogen
taken to establish case-and-effect relationship
protects against the disease.
between a pathogen and a lethal human illness?
Which of the following would make it extremely
difficult to satisfy all of Koch’s postulates for a The microbe cannot be isolated in pure culture.
particular microbe?
, A commensal E.coli strain usually found as part Delete the pil2 gene and test if the bacterium is
of the normal gut microbiota of chickens has a virulent in pigs, but not in chickens.
pilin gene (pil1) that is responsible for attaching
and colonizing chicken intestines but does not
cause disease. A clinical isolate of this E. coli
strain recently isolated from sick pigs still has pil
1 but now appears to also have a new pilin gene
(pil2). You think pil 2 is responsible for causing
infection in pigs.
How would you most directly test this
hypothesis?
A city has a population of 250,000 with 2,500
deaths per year from all causes. Of this
population, 10,000 have an incurable infectious
disease X. There are 1,000 new cases and 400 10,000/250,000
deaths each year from disease X.
The prevalence of disease X is .
According to this graph
of cases per capita in the
first few months of 2022,
which region in the
United States had the Northeast
lowest average of cases of
infection per capita
between February and
March?
A mosquito bites a person who then develops
fever and rash. What type of transmission would Biological vector transmission
this be?
Which of the following would be considered a A surface protein that allows the pathogen to
virulence factor of a pathogen? bind to the host cells.
Which of the following is not a characteristic Animal reservoirs are easier to eradicate than
associated with animal reservoirs? human reservoirs.
Carriers are dangerous because they exhibit all
They are symptomatic for infection
of the following, except.
