Microbiology worksheet with answers

Which disease has been eradicated worldwide through vaccination?

1. ASmallpox
2. BMalaria
3. CTuberculosis
4. DMeasles

Which structure do bacteria have but human cells do not?

1. ADNA
2. BA phospholipid cell membrane
3. CA peptidoglycan cell wall
4. DRibosomes

Which organism causes malaria?

1. AAnopheles
2. BTrypanosoma
3. CToxoplasma
4. DPlasmodium

Why are Gram-negative bacteria often harder to treat with antibiotics?

1. AThey divide much more slowly
2. BTheir outer membrane blocks many drugs
3. CThey have no ribosomes
4. DThey have a thicker peptidoglycan layer

Which is a function of the complement system?

1. APresenting antigens to T cells
2. BForming pores in the membranes of some bacteria
3. CMaking new red blood cells
4. DProducing antibodies against newly encountered antigens

MRSA is resistant to methicillin because it has:

1. AAn efflux pump for every antibiotic
2. BAn altered penicillin-binding protein (PBP2a)
3. CNo cell wall at all
4. DA polysaccharide capsule that blocks the entry of all beta-lactams

Corynebacterium diphtheriae causes diphtheria only if it produces diphtheria toxin. When does it make this toxin?

1. AWhen it carries a bacteriophage with the toxin gene
2. BOnly when it is grown at high temperature
3. CWhenever it is exposed to antibiotics
4. DOnly after it has conjugated with E. coli and received a plasmid

A child develops bloody diarrhoea after eating an undercooked burger, then a week later has kidney failure, anaemia and a low platelet count. Which organism is most likely?

1. AShiga toxin-producing E. coli such as O157:H7
2. BRotavirus
3. CStaphylococcus aureus
4. DClostridium perfringens