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Microbiology

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Sample exercises

Grades 7–10 · Microbiology

Are all microorganisms bacteria?

  1. Only if they cannot be seen unaided.
  2. No.
  3. Yes.
Answer and explanation

No.

The category includes several biological groups.

Grades 7–10 · Microbiology

Which feature fits bacteria?

  1. They have no genetic material.
  2. They are all multicellular animals.
  3. They lack a membrane-bound nucleus.
Answer and explanation

They lack a membrane-bound nucleus.

Bacteria are prokaryotic cells.

Grades 7–10 · Microbiology

Are viruses cells in the standard school model?

  1. Only plant viruses are cells.
  2. Yes, all have ribosomes and cytoplasm.
  3. No.
Answer and explanation

No.

Viruses are acellular and depend on host systems for replication.

Grades 7–10 · Microbiology

Give one beneficial ecological role of microorganisms.

Answer and explanation

Decomposition recycles nutrients.

Accept relevant roles such as nitrogen cycling or symbiotic associations.

Grades 7–10 · Microbiology

A supplied model count doubles from 50 to 100 and then doubles once more. What is the final count?

Answer and explanation

200

100 × 2 = 200; this is abstract arithmetic, not a culturing instruction.

Grades 7–10 · Microbiology

Is every microorganism harmful to humans?

  1. Yes, all microbes cause disease.
  2. No.
  3. Only if its name is long.
Answer and explanation

No.

Many are harmless or beneficial in context.

Study notes