Chapter 03

Instructions

Choose your answers from a-d by clicking the radio button next to each choice and then press 'Submit' to get your score.

Which of the following is correct regarding bacteria?

a) They have double stranded DNA enclosed in a nucleus.

b) Gram positive bacteria stain pink with the Gram stain.

c) Lipopolysaccharide is an integral component of the Gram negative cell wall.

d) Chlamydiae are obligate intracellular Gram negative bacteria.

Which of the following is correct regarding viruses?

a) They consist of genetic material enclosed in a lipid shell called the capsid.

b) Hepatitis B is an example of a cytopathic virus.

c) Herpes simplex virus is a retrovirus.

d) Epstein-Barr virus is oncogenic.

Which of the following is correct regarding fungi?

a) The fungal cell membrane is composed mostly of chitin.

b) Yeasts reproduce by forming spores.

c) Aspergillus spores are a known trigger of hypersensitivity pneumonitis.

d) Pneumocystis carinii pneumonia should be treated with high doses of antifungal agents.

Which of the following is correct regarding malaria?

a) The disease is caused by protozoa of the genus Plasmodium.

b) Sporozoites infect and multiply within red blood cells, leading to their rupture.

c) Most fatal cases are caused by Plasmodium vivax.

d) Acute renal failure is due to ischaemic acute tubular necrosis.

Which of the following is correct regarding the mode of action of antibacterial agents?

a) Glycopeptide antibiotics inhibit bacterial protein synthesis.

b) Macrolide antibiotics act by inhibiting bacterial cell wall synthesis.

c) Metronidazole acts by binding to, and breaking, bacterial DNA.

d) Aminoglycosides inhibit nucleic acid synthesis.