Microbiology worksheet with answers

In infection control, what is a vector?

1. AThe first person infected in an outbreak
2. BAn object such as a door handle that carries germs between patients on a ward
3. CA living organism that carries a pathogen from one host to another
4. DA drug used to prevent infection

Vaccines protect against disease mainly by:

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

What is the main function of bacterial flagella?

1. AMovement
2. BAttachment to host cells
3. CProtection against drying out
4. DStorage of nutrients

Which is a function of the complement system?

1. AProducing antibodies against newly encountered antigens
2. BMaking new red blood cells
3. CPresenting antigens to T cells
4. DForming pores in the membranes of some bacteria

MRSA is resistant to methicillin because it has:

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

Which part of the immune system produces antibodies?

1. APlasma cells derived from B lymphocytes
2. BNeutrophils
3. CCytotoxic T cells activated in the lymph nodes
4. DNatural killer cells

A positive blood culture shows Gram-positive cocci in clusters. Which organism is most likely?

1. ANeisseria
2. BStaphylococcus
3. CEnterococcus in short chains
4. DStreptococcus

What did Pasteur's swan-neck flask experiment demonstrate?

1. ABoiling cannot kill microorganisms
2. BMicroorganisms need light to grow
3. CMicroorganisms come from other microorganisms, not from spontaneous generation
4. DAir itself produces microorganisms