Microbiology worksheet with answers

How do bacteria usually reproduce?

1. ABudding from a spore
2. BMeiosis
3. CMitosis with a nuclear membrane
4. DBinary fission

Which of these is usually the smallest?

1. AA virus
2. BA red blood cell
3. CA bacterium
4. DA yeast cell

What is the most effective single measure to prevent the spread of infection in hospitals?

1. AKeeping windows closed
2. BWearing a face mask at all times
3. CGiving every patient antibiotics
4. DHand hygiene

Which organism causes typhoid fever?

1. ACampylobacter jejuni
2. BShigella dysenteriae
3. CSalmonella Typhi
4. DVibrio cholerae

Tetanus and diphtheria vaccines are toxoids. What does that mean?

1. AThey contain an inactivated toxin that still triggers an immune response
2. BThey contain ready-made antibodies against the toxin, giving passive immunity
3. CThey contain live bacteria that cannot make toxin
4. DThey contain the bacterial DNA only

In the lysogenic cycle of a bacteriophage, what happens to the phage DNA?

1. AIt is immediately used to make new phages that burst the cell
2. BIt is destroyed by the bacterium
3. CIt leaves the cell through the pilus
4. DIt is integrated into the bacterial chromosome as a prophage

A teenager has fever, neck stiffness and a non-blanching purple rash. CSF shows Gram-negative diplococci. Which organism is most likely?

1. AEscherichia coli
2. BListeria monocytogenes
3. CStreptococcus pneumoniae
4. DNeisseria meningitidis

A young adult with sore throat, fever and swollen lymph nodes is given amoxicillin and develops a widespread rash. Which infection is most likely?

1. AChickenpox
2. BStreptococcal tonsillitis
3. CInfectious mononucleosis caused by Epstein–Barr virus
4. DMeasles