Microbiology worksheet with answers

What is a bacteriophage?

1. AA bacterium that infects viruses
2. BA virus that infects bacteria
3. CAn antibiotic made by fungi
4. DA white blood cell that eats bacteria

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

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

Vaccines protect against disease mainly by:

1. AStimulating the immune system to form memory cells
2. BBlocking all viruses from entering cells
3. CProviding ready-made antibodies that remain in the blood for life
4. DKilling bacteria directly in the blood

Which antibody class is the first to rise in a new infection?

1. AIgM
2. BIgG
3. CIgE
4. DIgA

MRSA is resistant to methicillin because it has:

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

Toxoplasma gondii is a risk in pregnancy. Which advice reduces exposure?

1. AAvoid swimming pools and all other public bathing areas
2. BAvoid contact with dogs
3. CAvoid all fruit and vegetables
4. DAvoid cleaning cat litter and avoid undercooked meat

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. BNeisseria gonorrhoeae
3. CStreptococcus pneumoniae
4. DBordetella pertussis

Primary syphilis typically presents with:

1. AA widespread rash on the palms and soles
2. BDamage to the heart and brain
3. CA painful cluster of small blisters on the genitals or the mouth
4. DA painless ulcer (chancre) at the site of infection