Amino acids arë Fequired for the synthesis of p biosynthetic pathways to synthesize at least proteins. S while other E. coli strains cannot eukaryote, can synthesize tryptophan, while other S. cerevisiae strains cannot roteins. Living cells typically have some of the amino acids used in making J4. ome strains of E. coli, a prokaryote, can synthesize the amino acid tryptophan, . Similarly, some strains of the yeast S. cerevisiae, a hich of the following describes the most likely source of genetic variation found in the tryptophan synthesis pathways of both species? a. Exchange of genetic information occurs through crossing over b Viral transmission of genetic information required to synthesize tryptophan occurs c. Random assortment of chromosomes leads to genetic variation d. Errors in DNA replication lead to genetic variation