MCB exam unit 3 Questions And Answers
2026 Update!!!
In table 18.1 who is most
likely protected from the
disease, as observed by
the test results over time
-patient A patient D
-patient B
-patient C
-patient D
The rise in herd immunity against a population
can be directly attributed to
-vaccinations
-increased use of antibiotics vaccinations
-antibiotic-resistant microorganisms
-none of the answers is correct
-improved handwashing
Which of the following is NOT a verified
exception in the use of Koch's postulates
-some pathogens can cause several disease
conditions
-some diseases have poorly defined etiologies some diseases are noncommunicable
-some human diseases have no other known
animal host
-some diseases are not caused by microbes
-some diseases are noncommunicable
, In table 18.1, who showed patient A
seroconversion during
these observations?
-patient B
-patient A
-patient C
-patient D
The most frequently used portal of entry for
pathogens is the
-mucous membranes of the respiratory tract
-skin
mucous membranes of the respiratory tract
-mucous membranes of the gastrointestinal
tract
-all of these portals equally
-parenteral route
Which of the following are NOT lymphocytes?
-helper T cells
-NK cells
M cells
-cytotoxic T cells
-B cells
-M cells
Commensalism is best described as a(n)
-relationship in which a microorganism causes
disease
-source of contamination
-relationship between two organisms where relationship between two organisms where only
both members benefit one member benefits and the other is unharmed
-relationship between two organisms where
only one member benefits and the other is
unharmed
-unsuccessful invasion due to the presence of
preexisting microbes
,Biological transmission differs from mechanical
transmission in that biological transmission
-involves fomites
-involves reproduction of a pathogen in an
involves reproduction of a pathogen in an
arthropod vector prior to transmission
arthropod vector prior to transmission
-works only with noncommunicable diseases
-requires direct contact
-occurs when a pathogen is carried on the feet
of an insect
, A reservoir is
-any microorganism that causes disease
-an environment that is free of microbes
-a source of microbial contamination a source of microbial contamination
-a condition in which organisms remain in the
body for a short time
-a source of microbes for laboratory testing
In Figure 14.2, which one
of the following choices
has the highest morbidity
rate?
-July December
-December
-October
-November
The ID50 is
-the dose that will cause an infection in 50
perfect of the test population
-the dose that will kill 50 percent of the test
population the dose that will cause an infection in 50
-a measure of pathogenicity percent of the test population
-the dose that will kill some of the test
population
-the dose that will cause an infection in some of
the test population
All of the following are examples of entry via the
parenteral route EXCEPT
-injection
-surgery hair follicle
-hair follicle
-skin cut
-bite
The function of the "ciliary escalator" is to trap inhaled dust and microorganisms in mucus
and propel it away from the lower respiratory
-propel inhaled dust and microorganisms away
from the mouth, toward the lower respiratory tract.
tract.
2026 Update!!!
In table 18.1 who is most
likely protected from the
disease, as observed by
the test results over time
-patient A patient D
-patient B
-patient C
-patient D
The rise in herd immunity against a population
can be directly attributed to
-vaccinations
-increased use of antibiotics vaccinations
-antibiotic-resistant microorganisms
-none of the answers is correct
-improved handwashing
Which of the following is NOT a verified
exception in the use of Koch's postulates
-some pathogens can cause several disease
conditions
-some diseases have poorly defined etiologies some diseases are noncommunicable
-some human diseases have no other known
animal host
-some diseases are not caused by microbes
-some diseases are noncommunicable
, In table 18.1, who showed patient A
seroconversion during
these observations?
-patient B
-patient A
-patient C
-patient D
The most frequently used portal of entry for
pathogens is the
-mucous membranes of the respiratory tract
-skin
mucous membranes of the respiratory tract
-mucous membranes of the gastrointestinal
tract
-all of these portals equally
-parenteral route
Which of the following are NOT lymphocytes?
-helper T cells
-NK cells
M cells
-cytotoxic T cells
-B cells
-M cells
Commensalism is best described as a(n)
-relationship in which a microorganism causes
disease
-source of contamination
-relationship between two organisms where relationship between two organisms where only
both members benefit one member benefits and the other is unharmed
-relationship between two organisms where
only one member benefits and the other is
unharmed
-unsuccessful invasion due to the presence of
preexisting microbes
,Biological transmission differs from mechanical
transmission in that biological transmission
-involves fomites
-involves reproduction of a pathogen in an
involves reproduction of a pathogen in an
arthropod vector prior to transmission
arthropod vector prior to transmission
-works only with noncommunicable diseases
-requires direct contact
-occurs when a pathogen is carried on the feet
of an insect
, A reservoir is
-any microorganism that causes disease
-an environment that is free of microbes
-a source of microbial contamination a source of microbial contamination
-a condition in which organisms remain in the
body for a short time
-a source of microbes for laboratory testing
In Figure 14.2, which one
of the following choices
has the highest morbidity
rate?
-July December
-December
-October
-November
The ID50 is
-the dose that will cause an infection in 50
perfect of the test population
-the dose that will kill 50 percent of the test
population the dose that will cause an infection in 50
-a measure of pathogenicity percent of the test population
-the dose that will kill some of the test
population
-the dose that will cause an infection in some of
the test population
All of the following are examples of entry via the
parenteral route EXCEPT
-injection
-surgery hair follicle
-hair follicle
-skin cut
-bite
The function of the "ciliary escalator" is to trap inhaled dust and microorganisms in mucus
and propel it away from the lower respiratory
-propel inhaled dust and microorganisms away
from the mouth, toward the lower respiratory tract.
tract.
