MCB 100 Exam #3 UIUC Questions With Complete
Solutions
_________ is the process in which pathogens are coated with
antimicrobial proteins to increase the likelihood of phagocytosis.
A. Opsonization
B. Chemotaxis
C. Diapedesis
D. Endocytosis
E. Vasodilation Correct Answers A. Opsonization
__________ are protein molecules released by host cells that
inhibit the spread of viral infections.
A. Toll-like receptors
B. Complement
C. Defensins
D. Interferons
E. Lysozymes Correct Answers D. Interferons
____________ is the most common and longest-lasting class of
antibody in the blood.
A. IgG
B. IgM
C. IgD
D. IgE
E. IgA Correct Answers A. IgG
A virus with few antigens on its surface should be bound
_______ by antibodies specific to that antigen as compared to a
virus with many antigens on its surface.
A. less tightly
,B. more tightly
C. equivalently
D. not at all
E. completely Correct Answers A. less tightly
always present in population, seasonal Correct Answers
endemic
becomes major break out in one area Correct Answers epidemic
BJ is a sexually promiscuous 20-year old, who has had
gonorrhea five times in the last two years. Each time BJ goes to
the doctor and is given antibiotics, and the infection is cleared
up. Why is this bacterium (Neisseria gonorrhoeae) capable of
causing recurrent infections in BJ?
A. BJ has a very poor immune system, so is never able to clear
the bacteria without antibiotics.
B. BJ did not take all of the antibiotics when prescribed, so the
bacteria were able to go dormant in the body and get reactivated
later on.
C. BJ always takes the antibiotics before the immune system can
mount a response to the bacteria.
D. The bacterium has a high mutation rate that leads to antigenic
variation and no immune response.
E. The bacterium has a high mutation rate that leads to antigenic
variation and a non-protective immune response. Correct
Answers E. The bacterium has a high mutation rate that leads to
antigenic variation and a non-protective immune response.
Cold and influenza viruses typically enter the body through
which route?
, eyes
mouth
nose
parenteral routes
fecal Correct Answers eyes, mouth, nose
How can B-cells become activated WITHOUT the help of T
cells?
A. B-cells cannot become activated without the help of T-cells.
B. B-cells can become activated by directly binding antigen with
the B-cell receptor.
C. B-cells can become activated by the complement system.
D. B-cells can become activated by macrophages.
E. B-cells can become activated by cells that express the MHC-I
protein. Correct Answers B. B-cells can become activated by
directly binding antigen with the B-cell receptor.
How can viruses be more resistant than bacteria to lysozyme in
tears?
A. Tears are cold and viruses do not require warm temperatures
to replicate.
B. Viruses often live inside of bacteria and are not effected by
lysozyme.
C. Viruses have enzymes that inactivate lysozyme.
D. Lysozyme degrades peptidoglycan and viruses do not contain
peptidoglycan.
E. Bacteria require lysozyme to replicate while viruses do not.
Correct Answers D. Lysozyme degrades peptidoglycan and
viruses do not contain peptidoglycan.
Solutions
_________ is the process in which pathogens are coated with
antimicrobial proteins to increase the likelihood of phagocytosis.
A. Opsonization
B. Chemotaxis
C. Diapedesis
D. Endocytosis
E. Vasodilation Correct Answers A. Opsonization
__________ are protein molecules released by host cells that
inhibit the spread of viral infections.
A. Toll-like receptors
B. Complement
C. Defensins
D. Interferons
E. Lysozymes Correct Answers D. Interferons
____________ is the most common and longest-lasting class of
antibody in the blood.
A. IgG
B. IgM
C. IgD
D. IgE
E. IgA Correct Answers A. IgG
A virus with few antigens on its surface should be bound
_______ by antibodies specific to that antigen as compared to a
virus with many antigens on its surface.
A. less tightly
,B. more tightly
C. equivalently
D. not at all
E. completely Correct Answers A. less tightly
always present in population, seasonal Correct Answers
endemic
becomes major break out in one area Correct Answers epidemic
BJ is a sexually promiscuous 20-year old, who has had
gonorrhea five times in the last two years. Each time BJ goes to
the doctor and is given antibiotics, and the infection is cleared
up. Why is this bacterium (Neisseria gonorrhoeae) capable of
causing recurrent infections in BJ?
A. BJ has a very poor immune system, so is never able to clear
the bacteria without antibiotics.
B. BJ did not take all of the antibiotics when prescribed, so the
bacteria were able to go dormant in the body and get reactivated
later on.
C. BJ always takes the antibiotics before the immune system can
mount a response to the bacteria.
D. The bacterium has a high mutation rate that leads to antigenic
variation and no immune response.
E. The bacterium has a high mutation rate that leads to antigenic
variation and a non-protective immune response. Correct
Answers E. The bacterium has a high mutation rate that leads to
antigenic variation and a non-protective immune response.
Cold and influenza viruses typically enter the body through
which route?
, eyes
mouth
nose
parenteral routes
fecal Correct Answers eyes, mouth, nose
How can B-cells become activated WITHOUT the help of T
cells?
A. B-cells cannot become activated without the help of T-cells.
B. B-cells can become activated by directly binding antigen with
the B-cell receptor.
C. B-cells can become activated by the complement system.
D. B-cells can become activated by macrophages.
E. B-cells can become activated by cells that express the MHC-I
protein. Correct Answers B. B-cells can become activated by
directly binding antigen with the B-cell receptor.
How can viruses be more resistant than bacteria to lysozyme in
tears?
A. Tears are cold and viruses do not require warm temperatures
to replicate.
B. Viruses often live inside of bacteria and are not effected by
lysozyme.
C. Viruses have enzymes that inactivate lysozyme.
D. Lysozyme degrades peptidoglycan and viruses do not contain
peptidoglycan.
E. Bacteria require lysozyme to replicate while viruses do not.
Correct Answers D. Lysozyme degrades peptidoglycan and
viruses do not contain peptidoglycan.
