Module 12 Terms - Origin of Compartmentalization and the Eukaryotic Cell

Question 1

Symbiosis

Answer 1

A close association between two species

Question 2

Endosymbiosis

Answer 2

A form of symbiosis where one partner lives within the other

Question 3

Endosymbiosis theory

Answer 3

Postulates that chloroplasts/mitochondria were originally symbiotic cyanobacteria/protobacteria that came to reside permanently in their hosts

Question 4

What are the two theories for how eukaryotic cells originated?

Answer 4

1. A eukaryotic cell was formed first, and then it engulfed a proto/cyanobacterium, which eventually became the mitochondria/chloroplasts we know today
2. A archaeon and proto/cyanobacterium formed a symbiotic relationship, and these two eventually became a eukaryotic cell