Aset of flashcards on prokaryotes is being sorted into piles. which definition should not be placed in the pile for high-gc gram-positive bacteria? a. they have a higher proportion of adenine–thymine than guanine–cytosine base pairs. b. they include several medically important bacteria. c. one species that is a human pathogen arose three million years ago in east africa. d. some species reproduce by forming chains of spores at the tips of filaments. e. they develop an elaborately branched system of filaments.