Microbiology worksheet with answers

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

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

What is the main function of bacterial flagella?

1. AAttachment to host cells
2. BMovement
3. CProtection against drying out
4. DStorage of nutrients

The HPV vaccine mainly protects against:

1. AHIV infection
2. BHerpes simplex infection
3. CHepatitis B and liver cancer
4. DCervical and other cancers caused by human papillomavirus

Which bacterium is the most common cause of stomach ulcers?

1. AEscherichia coli
2. BClostridioides difficile
3. CStaphylococcus aureus
4. DHelicobacter pylori

Which organism is a Gram-negative diplococcus that causes a sexually transmitted infection?

1. ATreponema pallidum
2. BNeisseria gonorrhoeae
3. CChlamydia trachomatis
4. DTrichomonas vaginalis

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

1. AIgG
2. BIgM
3. CIgE
4. DIgA

Why are beta-lactamase inhibitors such as clavulanic acid combined with amoxicillin?

1. AThey slow the excretion of amoxicillin by the kidneys, raising its level
2. BThey kill bacteria by themselves through the cell membrane
3. CThey protect amoxicillin from bacterial enzymes that destroy it
4. DThey make amoxicillin active against viruses

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

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