Microbiology EXAM I test questions And Answers
A Gram negative bacterium
a. Has no peptidoglycan in its cell wall.
b. Has less LPS than a gram positive bacterium.
c. Contains a layer of teichoic acid.
d. Will always contain endotoxin.
e. Is resistant to the action of alcohol.
Will alwa...
a. Has no peptidoglycan in its cell wall.
b. Has less LPS than a gram positive bacterium.
c. Contains a layer of teichoic acid.
d. Will always contain endotoxin.
e. Is resistant to the action of alcohol.
Will always contain endotoxin.
If a bacteria makes β-lactamase, it
a. Has the ability to cleave the side chain off semisynthetic antibiotics.
b. Can make a sex pilus to transfer genetic material.
c. Produces an enzyme that inactivates lipid A.
d. Is producing an antibiotic that targets the 70S ribosome.
e. Can destroy the β-lactam ring structure of penicillin G.
Can destroy the β-lactam ring structure of penicillin G.
Which of the following will always affect the phenotype of an expressed protein?
a. Frameshift mutation.
b. Different codon usage.
c. Silent mutation
d. Base substitution
e. Point mutation
Frameshift mutation
Hfr+ cells
,a. Are products of transformation.
b. Usually transfer a complete F+ factor to a recipient cell.
c. Are unable to generate a sex pilus.
d. Must be competent to receive DNA.
e. Contain a complete F+ factor.
Contain a complete F+ factor
During which growth phase will Gram positive bacteria be MOST susceptible to
penicillin?
a. Lag phase
b. Stationary phase
c. Log phase
d. Lytic phase
e. The culture is equally susceptible during all phases.
Log phase
Which of the following is NOT true of virally transformed eukaryotic cells?
a. Transformed cells can start tumors in susceptible animals.
b. Where and how the virus integrates plays a role in viral transformation.
c. Oncogenes are mutant forms of regulatory proteins brought in by the virus.
d. Transformed cells are immortalized (capable of multiplying indefinitely).
e. Primarily caused by RNA viruses.
Primarily caused by RNA viruses.
Which of the following is a correctly written scientific name of a prokaryote?
a. Gram positive bacilli
b. Serratia marcescens
c. Streptococcus pyogenes
d. Escherichia Coli
e. Group A streptococcus
, Streptococcus pyogenes
Note: I copied this over from a Word doc. Somethings were lost in translation.
Option C was correct b/c it was italicized and pyogenes was lower case.
The reaction catalyzed by RDRP is
a. mRNA→protein
b. DNA→mRNA
c. RNA→RNA
d. mRNA→ cDNA
e. DNA→cDNA
RNA→RNA
Which of the following statements is NOT true regarding viruses?
a. They can contain either RNA or DNA, never both.
b. A naked virus can both fuse and endocytose into a cell to infect.
c. They must uncoat to release their genome into a cell.
d. Enveloped viruses bud from a cell.
e. Hundreds of virions can be produced in one generation time.
A naked virus can both fuse and endocytose into a cell to infect.
What is the quickest and most effective way reduce the time necessary for your
disinfectant to work?
a. Increase the amount of solution you pour on to it.
b. Decrease the temperature you are working at.
c. Wipe off the surface with soap prior to treatment.
d. Increase the pH of the solution you are using.
e. None of the above would affect the treatment positively.
Wipe off the surface with soap prior to treatment.
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