3. Which describes an animal cell?
O It has a cell membrane but no cell wall.
It has both a cell membrane and a cell wall.
It has neither a cell membrane nor a cell wall.
It has a cell wall but no cell membrane.

Part a - which gene to compare? in this exercise, you will use the cytochrome c oxidase i (coi) gene to investigate relationships among salmon species. (this gene encodes a protein that functions in the mitochondrial electron transport chain.) you will compare the coi gene sequences from your salmon test samples to the standard sequences for each salmon species. in order for the coi gene to be useful for distinguishing among the different salmon species, which three statements must be true?