Everyday Science · Cell Biology & Microorganisms · page 4 of 22

Bacteria MCQs with Answers

Includes 22 past paper MCQs (marked).

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Bacteria, Viruses & Microorganisms MCQs (31–40)

10 MCQs with answers and a short one-liner. Hide answers to test yourself.

Past paper MCQs in this chapter · See all past papers

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31.
Simplest oxygen-producing organisms are _?
Correct Answer: B. Cyanobacteria
One-liner
The simplest oxygen-producing organisms are Cyanobacteria, also known as blue-green algae.
32.
Amoeba is a/an _?
Correct Answer: A. Unicellular organism
One-liner
Amoeba is a unicellular organism, meaning it is made up of only one cell.
33.
A cup of yogurt can have up to _ of bacteria?
Correct Answer: C. Billions
One-liner
A cup of yogurt can have up to billions of bacteria.
34.
Bacteria cells have the ability to maintain their shape through
Correct Answer: D. Cell wall
One-liner
Bacteria cells maintain their shape through the cell wall, a rigid outer layer that provides structural support and protection.
35.
Past Paper MCQ
Food is fermented by
Correct Answer: A. Bacteria
One-liner
Food is fermented by bacteria (and also by yeasts/fungi), which break down sugars into acids, alcohols, or gases.
36.
Insulin is manufactured commercially using genetic engineering. Which of the following organisms is used to produce large quantities of insulin in this way?
Correct Answer: A. Bacteria
One-liner
Genetically engineered bacteria (specifically *E. coli*) are used to produce large quantities of human insulin commercially.
37.
Lipid-rich component of bacterial cell are ?
Correct Answer: D. Cell membrane
One-liner
The lipid-rich component of a bacterial cell is the cell membrane.
38.
How would you classify a bacterium having a group of 2 or more flagella at one pole?
Correct Answer: B. Lophotrichous
One-liner
A bacterium with a tuft or group of two or more flagella at one pole is classified as lophotrichous.
39.
Locomotory organ of bacteria is called ?
Correct Answer: A. Flagella
One-liner
The locomotory organ of bacteria is called Flagella.
40.
Which group of organisms may consist of one or more cells?
Correct Answer: C. Both A & B
One-liner
Both prokaryotes and eukaryotes may consist of one or more cells, as both groups include unicellular and multicellular organisms.

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Bacteria MCQs with Answers

Bacteria, Viruses & Microorganisms MCQs (31–40)

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