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Microbiology

Learn the toughest concepts covered in Microbiology with step-by-step video tutorials and practice problems by world-class tutors.

21. Principles of Disease

Symbiotic Relationships

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Symbiotic Relationships

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Problem

Organisms that interact and live together on a permanent basis are in a relationship termed:

Mutualism.

Parasitism.

Symbiosis.

Transient microbiota.

Problem

A relationship between two organisms in which one partner benefits and the other is harmed is termed:

Commensalism.

Parasitism.

Independence.

Mutualism.

Problem

Which of the following is an example of a commensal relationship?

Fungi residing in plant roots and the fungi providing the plant nutrients.

Bacteria fixing nitrogen in the roots of some plants and the plants providing shelter for the bacteria.

Rancher ants that protect aphids in exchange for sugar-rich honeydew that the aphids create.

Cattle egrets eating insects stirred up by grazing bison in a meadow.

Problem

Our microbiome is composed of a variety of microorganisms that live within and on our bodies. Research has shown our microbiota protects us against infectious pathogens, creates vitamins and minerals we need, and helps us digest our food. We act as a safe residence and food source for our microbiota. The relationship humans have with their microbiome could be described as?

a) A commensal relationship.

b) A resident relationship.

c) A mutual relationship.

d) A parasitic relationship.

A commensal relationship.

A resident relationship.

A mutual relationship.

A parasitic relationship.

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