MSU MMG 301 Exam 3 questions n
answers graded A+ 2025/2026
What do Hepatitis A, Norovirus, and Rhinovirus have in common?
A. They are flaviviruses
B. They have naked virions
C. They are spread by animal vectors
D. They are small DNA viruses
E. They cause vomiting and diarrhea - correct answer ✔✔B. They have naked virions
five different antibiotic-infused discs (A-E) are added on top of a bacterial lawn. According to the
results of the disc diffusion assay shown on the right, which antibiotic is
LEAST effective against this bacterium?
A, B, C, D, or E? - correct answer ✔✔A
Why has it been difficult to make an effective vaccine for gonorrhea?
A.
The pathogen obtains new antigens via horizontal gene transfer
B.
The pathogen is resistant to antibiotics
C.
The pathogen modifies its antigens via antigenic variation
,D.
A and C are reasons there is not an effective vaccine for gonorrhea.
E.
All of the above are reasons there is not an effective vaccine for gonorrhea - correct answer
✔✔D.
A and C are reasons there is not an effective vaccine for gonorrhea.
The table to the right shows R0
values for five infectious diseases. Which disease will require the HIGHEST
herd immunity in a population to prevent transmission?
A.
HIV
B.
Polio
C.
Ebola
D.
Pertussis
E.
Measles - correct answer ✔✔E. Measles
Viral replication:
A. Always requires polymerases
B. Always has a DNA intermediate
C. Always occurs in the nucleus
, D. Always involves membrane budding
E. Always lyses the host cell - correct answer ✔✔A. Always requires polymerases
The following are emerging infectious organisms or diseases discussed in the course
EXCEPT
....
A.
MRSA
B.
CRE
C.
Campylobacter
D.
Zika - correct answer ✔✔C.
Campylobacter
Which immune cell -- function match is correct?
A.
B cell -- produces granzyme that kills infected host cells
B.
APC -- produces antibodies that neutralize invading pathogens or toxins
C.
Th1 -- engulfs pathogens using PRRs that recognize PAMPs expressed on the
surface of invading microbes
D.
Th2 -- stimulates activation of B cells for antibody production by producing
answers graded A+ 2025/2026
What do Hepatitis A, Norovirus, and Rhinovirus have in common?
A. They are flaviviruses
B. They have naked virions
C. They are spread by animal vectors
D. They are small DNA viruses
E. They cause vomiting and diarrhea - correct answer ✔✔B. They have naked virions
five different antibiotic-infused discs (A-E) are added on top of a bacterial lawn. According to the
results of the disc diffusion assay shown on the right, which antibiotic is
LEAST effective against this bacterium?
A, B, C, D, or E? - correct answer ✔✔A
Why has it been difficult to make an effective vaccine for gonorrhea?
A.
The pathogen obtains new antigens via horizontal gene transfer
B.
The pathogen is resistant to antibiotics
C.
The pathogen modifies its antigens via antigenic variation
,D.
A and C are reasons there is not an effective vaccine for gonorrhea.
E.
All of the above are reasons there is not an effective vaccine for gonorrhea - correct answer
✔✔D.
A and C are reasons there is not an effective vaccine for gonorrhea.
The table to the right shows R0
values for five infectious diseases. Which disease will require the HIGHEST
herd immunity in a population to prevent transmission?
A.
HIV
B.
Polio
C.
Ebola
D.
Pertussis
E.
Measles - correct answer ✔✔E. Measles
Viral replication:
A. Always requires polymerases
B. Always has a DNA intermediate
C. Always occurs in the nucleus
, D. Always involves membrane budding
E. Always lyses the host cell - correct answer ✔✔A. Always requires polymerases
The following are emerging infectious organisms or diseases discussed in the course
EXCEPT
....
A.
MRSA
B.
CRE
C.
Campylobacter
D.
Zika - correct answer ✔✔C.
Campylobacter
Which immune cell -- function match is correct?
A.
B cell -- produces granzyme that kills infected host cells
B.
APC -- produces antibodies that neutralize invading pathogens or toxins
C.
Th1 -- engulfs pathogens using PRRs that recognize PAMPs expressed on the
surface of invading microbes
D.
Th2 -- stimulates activation of B cells for antibody production by producing
