Microbiology worksheet with answers

Free printable Microbiology worksheet: 8 problems from easy to exam level, with an answer key. Print it or save it as a PDF.

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1.Easy

Which bacterium is the classic cause of "strep throat"?

  1. AStaphylococcus aureus
  2. BStreptococcus pneumoniae
  3. CHaemophilus influenzae
  4. DStreptococcus pyogenes
2.Easy

What is the main function of bacterial flagella?

  1. AStorage of nutrients
  2. BMovement
  3. CProtection against drying out
  4. DAttachment to host cells
3.Easy

What is agar used for in a microbiology laboratory?

  1. ATo kill bacteria on surfaces
  2. BTo dissolve bacterial cell walls
  3. CTo make culture media solid
  4. DTo stain bacteria purple
4.Medium

Which statement is one of Koch's postulates?

  1. AThe organism must cause the same disease when introduced into a healthy susceptible host
  2. BThe organism must be visible with the naked eye
  3. CThe disease must respond to antibiotics
  4. DThe organism must be found in healthy people as well
5.Medium

Which type of immunity is given by breast milk antibodies?

  1. AArtificial passive immunity
  2. BNatural active immunity
  3. CArtificial active immunity
  4. DNatural passive immunity
6.Medium

Which cells does HIV mainly infect and destroy?

  1. ARed blood cells
  2. BCD4 T helper cells
  3. CNeutrophils
  4. DPlatelets
7.Hard

Gram-positive cocci are found. Which test quickly separates staphylococci from streptococci?

  1. AGrowth on MacConkey agar
  2. BThe coagulase test
  3. CThe catalase test
  4. DThe acid-fast stain
8.Hard

How do retroviruses such as HIV copy their genome into the host DNA?

  1. AThe viral DNA is copied directly by host RNA polymerase
  2. BReverse transcriptase makes DNA from viral RNA, and integrase inserts it
  3. CHost DNA polymerase copies the RNA without help
  4. DThe viral RNA is translated into DNA by ribosomes

Answer key

  1. 1. D · Streptococcus pyogenes
  2. 2. B · Movement
  3. 3. C · To make culture media solid
  4. 4. A · The organism must cause the same disease when introduced into a healthy susceptible host
  5. 5. D · Natural passive immunity
  6. 6. B · CD4 T helper cells
  7. 7. C · The catalase test
  8. 8. B · Reverse transcriptase makes DNA from viral RNA, and integrase inserts it

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