Microbiology worksheet with answers

What is a yeast?

1. AA multicellular parasite
2. BA small virus
3. CA single-celled fungus
4. DA type of spiral bacterium

What is meant by the normal flora (microbiota) of the body?

1. ABacteria that always cause mild infections
2. BThe white blood cells in healthy tissue
3. CMicroorganisms found only in sick patients
4. DMicroorganisms that normally live on or in the body without causing disease

What is a plasmid?

1. AThe protein coat of a virus
2. BA type of bacterial ribosome
3. CA layer of sugar around the bacterial cell that protects it from phagocytosis
4. DA small circle of DNA separate from the bacterial chromosome

Which white blood cells are the main phagocytes in an acute bacterial infection and the main component of pus?

1. AB lymphocytes
2. BBasophils
3. CEosinophils
4. DNeutrophils

MRSA is resistant to methicillin because it has:

1. AA polysaccharide capsule that blocks the entry of all beta-lactams
2. BNo cell wall at all
3. CAn efflux pump for every antibiotic
4. DAn altered penicillin-binding protein (PBP2a)

Which statement is one of Koch's postulates?

1. AThe organism must cause the same disease when introduced into a healthy susceptible host
2. BThe organism must be found in healthy people as well
3. CThe organism must be visible with the naked eye
4. DThe disease must respond to antibiotics

A traveller returns from sub-Saharan Africa with fever. Malaria is suspected. Which species is most likely to cause severe and cerebral malaria?

1. APlasmodium vivax
2. BPlasmodium ovale
3. CPlasmodium malariae
4. DPlasmodium falciparum

A deep, dirty wound becomes swollen and very painful, and gas can be felt under the skin. Which organism is most likely?

1. AClostridium perfringens
2. BBordetella pertussis
3. CNeisseria gonorrhoeae
4. DStreptococcus pneumoniae