endosymbiosis
Pronunciation
Noun
C1 Advanced
Quick answer
A relationship in which one organism lives inside the cells of another, to the point that the two become mutually dependent, as is believed to have happened with mitochondria.
Test yourself
Which word fits the gap? "The theory of _____ suggests mitochondria were once free-living bacteria absorbed by an ancestral cell."
Answer: endosymbiosis
In your own words, what does "endosymbiosis" mean?
A relationship in which one organism lives inside the cells of another, to the point that the two become mutually dependent, as is believed to have happened with mitochondria.
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