Microbiology Quiz #4

Impetigo is due to an infection caused by:
a) Staphylococcus aureus but not Streptococcus pyogenes.
b) Streptococcus pyogenes but not Staphylococcus aureus.
c) both Staphylococcus aureus and Streptococcus pyogenes.
d) neither Staphylococcus aureus nor Streptococcus pyogenes.

Which of the following toxins or extracellular enzymes is produced by Staphylococcus epidermidis?
a) enterotoxin
b) coagulase
c) hemolysins
d) none of the above

Which of the following bases are (is) a purine?
a) G
b) A
c) C
d) U
e) T

The set of the genes that make up an organism is called the [________] where as the [_________] is the set of characteristic of the organism

Match the mutation with its description.
1) The change of a DNA base that changes the codon to a different Amino Acid
2) The change of a DNA base that changes the codon to a STOP codon
3) A change in the DNA sequence that is the insertion of 2 bases
4) A change in the RNA sequence that change one amino acid for another

a) Frameshift
b) Not a mutation
c) Nonsense
d) Missense

The 2' (prime) OH in DNA is responsible for extending the DNA chain.

True or False?

All of the following are characteristic of the Group A beta-hemolytic streptococci EXCEPT:
a) M proteins
b) hyaluronidase production.
c) methicillin resistance
d) the ability to damage cell membranes.
e) the ability to dissolve blood clots

Encapsulated strains of Streptococcus pneumoniae are particularly pathogenic, because they:
a) are potentially very invasive
b) produce exotoxin A
c) produce M protein surface antigens.
d) produce exotoxin B

All of the following are normal microbiota of the skin EXCEPT:
a) Streptococcus
b) Corynebacterium.
c) Staphylococcus
d) Proprionibacterium
e) Micrococcus

Exfoliative toxin is responsible for:
a) thrush
b) impetigo
c) fever blisters
d) scalded skin syndrome
e) otitis externa.