Two strains of E. coli were developed, each of which overproduced an amino acid, either histidine or tryptophan. When grown together in medium with adequate amino acids, they grew but did not associate with each other. When these strains were grown together in medium without histidine and tryptophan, they grew and formed ________ in order to ________.
A) carboxysomes; share the excess of the two amino acids B) carboxysomes; provide ATP to each other to make the missing amino acids C) nanotubes; share the excess of the two amino acids D) nanotubes; provide ATP to each other to make the missing amino acids E) heterocysts; share the excess of the two amino acids