Acell biologist treated some cells with a stain. she found that the stain was concentrated within the mitochondria of many types of cells. which conclusion could the cell biologist draw regarding the results of this test? a. the stain could be used to identify mitochondria in living cells b. the stain could be used to determine if cells were alive or dead. c. all stains will be absorbed by mitochondria. d. all mitochondria create stains.