BIO 440 Lecture Exam 2024/2025 with 100% correct answers
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BIO 440 Lecture
Institution
BIO 440 Lecture
A heritable change in DNA sequence (or RNA sequence in RNA viruses)
a. anomaly
b. mutation
c. DNA damage
d. pyrimidine dimer correct answersb. mutation
As a result of mistakes made by the RNA dependent RNA polymerases, influenza viruses demonstrate:
a. antigenic confusion
b. antigenic...
A heritable change in DNA sequence (or RNA sequence in RNA viruses)
a. anomaly
b. mutation
c. DNA damage
d. pyrimidine dimer correct answersb. mutation
As a result of mistakes made by the RNA dependent RNA polymerases, influenza viruses demonstrate:
a. antigenic confusion
b. antigenic shift
c. antigenic drift
d. lysis correct answersc. antigenic drift
Newly formed influenza viruses would naturally clump together if _____________is inhibited by
"Tamiflu":
a. sialic acid
b. hemagglutin
c. gp41
d. neuraminidase correct answersd. neuraminidase
(Historically....) How are vaccine influenza viruses grown?
a. in human diploid cell culture
b. in embryonated eggs
,c. in mice
d. in humans correct answersb. in embryonated eggs
Is avian influenza H5N1 a zoonosis?
a. yes
b. no correct answersa. yes
When the live R strain was mixed with dead S strain and injected into mice, what was the result?
a. the mice lived
b. half the mice died, half became paralyzed but lived
c. the mice all died
d. the mice lived and became resistant to living, virulent S strain correct answersc. all the mice died
In E.coli, the F factor carries genes for this process.
a. transformation
b. transduction
c. conjugation correct answersc. conjugation
Which process may involve lytic (e.g. T-even phage) and/or temperate bacteriophage (e.g. lambda
phage)?
a. transformation
b. transduction
c. conjugation correct answersb. generalized transduction
An Hfr tetracycline resistant (chromosomally encoded) E.coli O157:H7 donor mates with an
, antibiotic sensitive, non-toxin producing E.coli F- recipient in the intestinal tract of one of your patients
(who has profuse diarrhea).
Which of the following is LEAST LIKELY to occur?
a. The recipient may become tetracycline resistant
b. The recipient may acquire the Shiga-like toxin gene
c. The recipient may become tetracycline resistant AND acquire the Shiga-like toxin gene
d. The recipient will also become an Hfr donor correct answersd. the recipient will also become an Hfr
donor
One reservoir of E.coli O157:H7 is cattle, thus this pathogen is:
a. zoonotic
b. viral
c. prional
d. trouble correct answersa. zoonotic
How did your patient most likely become infected with E. coli O157:H7?
a. vehicle transmission: ate fecal- contaminated hamburger or raw vegetables
b. airborne transmission
c. parenteral: inoculation under the skin
d. arthropod vector transmission correct answersa. vehicle transmission: ate fecal- contaminated
hamburger or raw vegetables
The "holes" formed in a lawn of bacteria by bacteriophage are called:
a. pores
b. vesicles
c. plaques
d. pustules correct answersc. plaques
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