7
AssignmentMultiple Choice

Common Ancestry

Question 7 • AFC AP Biology B5

Which statement best describes the origin of eukaryotes?

Answer
A
Eukaryotes first evolved on land where there were open habitats.
B
Archaea and Bacteria microorganisms developed a hybrid organism.
C
Bacteria cells were internalized by early eukaryotic cells, which were probably similar to early Archaea.
D
Bacteria and eukaryotes evolved together, competing with microorganisms in the domain Archaea.

Explanation

The endosymbiotic theory explains eukaryote origins: an early cell, probably related to Archaea, engulfed bacteria that eventually became organelles such as mitochondria. This is best described by choice C. Choice B is less accurate because it does not specify that bacteria were engulfed and became part of the early eukaryotic cell.

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