Microbiology worksheet with answers

Which of these is a protozoan?

1. AGiardia lamblia
2. BCandida albicans
3. CRotavirus
4. DEscherichia coli

Which structure do bacteria have but human cells do not?

1. AA phospholipid cell membrane
2. BRibosomes
3. CDNA
4. DA peptidoglycan cell wall

What is a pandemic?

1. AA disease that is always present at a low, stable level in a region
2. BAn epidemic that spreads across several countries or continents
3. CAn outbreak limited to one hospital ward
4. DA single case of a rare disease

How do people usually become infected with Legionella pneumophila?

1. ABy inhaling aerosols from contaminated water systems
2. BBy person-to-person spread through kissing
3. CBy being bitten by an infected tick
4. DBy eating undercooked chicken or unpasteurised milk products

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

1. AIgG
2. BIgE
3. CIgA
4. DIgM

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

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

What does an R0 (basic reproduction number) of 3 mean?

1. AThree doses of vaccine are needed
2. BOn average one case infects three others in a fully susceptible population
3. CThe infection lasts three days
4. DThree percent of infected people die

What is the key difference between bactericidal and bacteriostatic antibiotics?

1. ABactericidal drugs work only outside the body
2. BBactericidal drugs work only on viruses; bacteriostatic drugs work on bacteria
3. CBacteriostatic drugs always work faster than bactericidal drugs
4. DBactericidal drugs kill bacteria; bacteriostatic drugs stop growth and rely on the immune system to clear them