The discovery that single-celled sister groups of animals synthesize proteins known to play roles in animal development tells us that:
A)the single-celled sister groups are derived from more complex multicellular ancestors
B)the single-celled sister groups use the proteins in question for functions other than multicellular development.
C)these proteins are found ubiquitously through the eukaryotic tree of life.
D)All of these choices are correct.

Question

Quizplus · Accepted Answer

The fact that single-celled sister groups of animals synthesize proteins known to play roles in animal development does not necessarily suggest that these groups are derived from more complex multicellular ancestors (choice A) or that these proteins are found ubiquitously throughout the eukaryotic tree of life (choice C). Instead, the most likely explanation is that the proteins in question are used by these single-celled organisms for functions other than multicellular development (choice B).

The Discovery That Single-Celled Sister Groups of Animals Synthesize Proteins