Test 25 (MCQs on microbiology)

1. The following are true about disinfectants that can be used effectively for skin:

a. glutaraldehyde

b. chlorhexidine

c. ethyl alcohol with povidone-iodine

d. ethylene oxide

e. chloramphenicol drops

answera.F   b.T   c.T   d.F   e.F
Glutaraldehyde and ethylene oxide are too toxic for skin and chloramphenicol can not be used as disinfectants as its antimicrobial activity is not wide enough.
 

2. Viral with oncogenic properties in humans include:

a. measles virus

b. hepatitis B virus

c. papovavirus

d. Epstein-Barr virus

e. cytomegalovirus

answera.F   b.T   c.T   d.T   e.F
Hepatitis B virus - hepatocellular carcinoma
Papovavirus - genital tract malignancies
Epstein-Barr virus - Burkitt's lymphoma and nasopharyngeal carcinoma
 

3. Antibiotics that inhibit cell wall synthesis include:

a. cefuroxime

b. erythromycin

c. vancomycin

d. sulphonamide

e. benzylpenicillin

answera.T   b.F   c.T   d.F   e.T
Erythromycin acts by disruption of protein synthesis by binding to ribosomes.
Sulphonamide inhibits folate synthesis.
 

4. Micro-organisms that can cause latent infection include:

a. Mycobacterium tuberculosis

b. varicella-zoster virus

c. cytomegalovirus (CMV)

d. hepatitis A

e. chlamydia trachoma

answera.T   b.T   c.T   d.F   e.T
 

5. Aminoglycoside:

a. are active against streptococcus

b. acts on the bacterial cell wall 

c. are useful against anaerobes

d. should not be used in patients with renal failure

e. damages the cochlear nerve

answera.T   b.F   c.F   d.F   e.T
Aminoglycoside includes gentamicin, amikacin and neomycin
Some streptococcus may be resistant to aminoglycoside
It works on the ribosomes.
It can be used in patients with renal failure with close monitoring of the blood levels