Home Biology Organisms and Populations Organism and its Enviornment Human cells contain mitochondria, which are …
Biology Organisms and Populations Organism and its Enviornment Single Correct MCQ
Published on: August 14, 2026

Human cells contain mitochondria, which are responsible for producing the energy needed by our cells. Remember that the ancestors of mitochondria may once have been free-living prokaryotes. If mitochondria were still considered to be separate organisms within our cells, which of the following would best describe our relationship with them?

A
Parasitic
B
Mutualistic
C
Competitive
D
Pathogenic

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The correct answer is:
B

Mitochondria provide energy (ATP) to human cells, while human cells provide them with protection and nutrients. Thus, if considered separate organisms, the relationship would be mutualistic.

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