MCB 100 Test 3 Questions With Complete Solutions
Bacteria that would be the least virulent when ingested Correct
Answers Bacterium that does not have a capsule or an intestinal
cell-binding pilus, but secretes an slgA protease
Bacteria that would be the most virulent when ingested Correct
Answers Bacterium that has a capsule and an intestinal cell-
binding pilus and secretes an slgA protease
Beneficial aspect of fevers for fighting an infection Correct
Answers Fever elevates body temperatures to inhibit the growth
of some microbes
Carriers are dangerous because they exhibit all of the following
Correct Answers Do not show signs of infection
Are unaware that they are spreading disease
Are difficult to identify and quarantine
Are more common in a population than most think
Cells that are antigen-presenting cells Correct Answers B-cell
Dendritic cell
Macrophage
Cells that are NOT antigen-presenting cells Correct Answers
Mast cell
Neutrophil
Characteristics of animal reservoirs Correct Answers Naturally
infected with the pathogen
More difficult to control than human behaviors
,Maintain the presence of the pathogen over time
Can transmit the disease to a new susceptible host
Example of a physical barrier that acts as an innate immune
defense Correct Answers Skin
Examples of innate immunity Correct Answers Saliva
Bile salts
Normal microbiota
Mucus
Low pH in stomach
Skin
Lysozyme in tears
General mechanisms of the innate immune response Correct
Answers Mechanical movements
Microbiome
Physical barriers
Chemical production
Horizontal gene transfer in influenza is more likely to cause
Correct Answers Antigenic shift
How can B-cells activate without the help of T-cells? Correct
Answers By directly binding antigen with B-cell receptor
How can B-cells become activated to produce antibodies?
Correct Answers Directly binding antigen with the B-cell
receptor
Th-cells (helper T-cells) secreting cytokines
, How can viruses be more resistant than bacteria to lysozyme in
tears? Correct Answers Lysozyme degrades peptidoglycan and
viruses do not contain peptidoglycan
How coronavirus acquire host membrane components in their
envelope Correct Answers Bud from the ER in order to obtain
host membrane components
How do bacteria avoid the immune system through antigenic
variation? Correct Answers Random mutagenesis
Gene conversion
Gene swapping
Homologous recombination
How Tc cell recognizes a cell infected with coronavirus Correct
Answers CD8 receptor from the activated Tc cell interacts with
the MHC-I protein on the infected cell that presents a
coronavirus epitope
How would you test if an E.coli strain from a recent outbreak is
important for secreting a particular protein toxin that is
important for virulence? Correct Answers Make a mutation in
the secretion system and see if the toxin still gets secreted
In which tissues location do T-cells mature? Correct Answers
Thymus
Inside of which tissues to B-cells mature? Correct Answers
Bone marrow
Bacteria that would be the least virulent when ingested Correct
Answers Bacterium that does not have a capsule or an intestinal
cell-binding pilus, but secretes an slgA protease
Bacteria that would be the most virulent when ingested Correct
Answers Bacterium that has a capsule and an intestinal cell-
binding pilus and secretes an slgA protease
Beneficial aspect of fevers for fighting an infection Correct
Answers Fever elevates body temperatures to inhibit the growth
of some microbes
Carriers are dangerous because they exhibit all of the following
Correct Answers Do not show signs of infection
Are unaware that they are spreading disease
Are difficult to identify and quarantine
Are more common in a population than most think
Cells that are antigen-presenting cells Correct Answers B-cell
Dendritic cell
Macrophage
Cells that are NOT antigen-presenting cells Correct Answers
Mast cell
Neutrophil
Characteristics of animal reservoirs Correct Answers Naturally
infected with the pathogen
More difficult to control than human behaviors
,Maintain the presence of the pathogen over time
Can transmit the disease to a new susceptible host
Example of a physical barrier that acts as an innate immune
defense Correct Answers Skin
Examples of innate immunity Correct Answers Saliva
Bile salts
Normal microbiota
Mucus
Low pH in stomach
Skin
Lysozyme in tears
General mechanisms of the innate immune response Correct
Answers Mechanical movements
Microbiome
Physical barriers
Chemical production
Horizontal gene transfer in influenza is more likely to cause
Correct Answers Antigenic shift
How can B-cells activate without the help of T-cells? Correct
Answers By directly binding antigen with B-cell receptor
How can B-cells become activated to produce antibodies?
Correct Answers Directly binding antigen with the B-cell
receptor
Th-cells (helper T-cells) secreting cytokines
, How can viruses be more resistant than bacteria to lysozyme in
tears? Correct Answers Lysozyme degrades peptidoglycan and
viruses do not contain peptidoglycan
How coronavirus acquire host membrane components in their
envelope Correct Answers Bud from the ER in order to obtain
host membrane components
How do bacteria avoid the immune system through antigenic
variation? Correct Answers Random mutagenesis
Gene conversion
Gene swapping
Homologous recombination
How Tc cell recognizes a cell infected with coronavirus Correct
Answers CD8 receptor from the activated Tc cell interacts with
the MHC-I protein on the infected cell that presents a
coronavirus epitope
How would you test if an E.coli strain from a recent outbreak is
important for secreting a particular protein toxin that is
important for virulence? Correct Answers Make a mutation in
the secretion system and see if the toxin still gets secreted
In which tissues location do T-cells mature? Correct Answers
Thymus
Inside of which tissues to B-cells mature? Correct Answers
Bone marrow
