Microbiology: 1. The following probably would not grow in MS agar a) Pseudomonas
ID: 74563 • Letter: M
Question
Microbiology:
1. The following probably would not grow in MS agar
a) Pseudomonas spp.
b) Staphylococcus aureus
c) E. Coli
d) A and C
2. The normal microbiota of the mouth could include
a) Streptococcus mutans
b) Streptococcus salivarius
c) Neisseria species
d) A and B
3.The diphtheria toxin
a) An example of lysogenic conversion
b) An example of an AB toxin
c) Was used by Emil von Behring to discover antitoxins
d) All of the above
4. The Killer T cells help defend the body by killing altered self and cancer cells with
a) Perforins
b) Granzymes
c) Granuolysins
d) All of the above
5. Treatments for disseminated aspergillosis could be
a) IV Iatroconazole
b) Amphotericin B
c) IV ketoconazole
d) All of the above
Explanation / Answer
1. d) both A and C - Pseudomonaas spp and E.coli these bacteria does not grown on Mannitol salt agar . Because the level of the salt in this medium inhibits the growth of many bacteria it is suitable to the staphalococci bacterial growth.
2. d) both A and B - Streptococcus Mutants and Streptococcus salivaris both microbiota are present in the mouth. Streptococcus mutants in new born and Streptococcus salivaris after the growth of teeth.
3. d) All of the above - It was discovered by Emil von Behring and was used to discover antitoxins.
It is an example of lysogenic conversion because its action was after converting into lysogenic phase.
It is an example of AB toxin in which B subuit was for attachment on host and A subunit for penetration into host cell.
4. d) All of the above - Perforins - They help in creating a hole into the cells.
Granzymes - After perforations the granzymes enter and create osmotic imbalance.
Granuolysins - These causes the celllysis or cell breakdown which is cell death.
5. b) Amphotericin B - Aspergillosis is mainly in the people infected with Tuberculosis and Chronic Obstructive Pulmonary Disease. This Amphotericin B along with some bacteria killing drugs are used for treatment.