57) A low therapeutic index is a sign of a good drug. B 58) A diauxic growth curve can be expected when bacteria run out of glucose and can't find lactose B 59) A diauxic curve is evidence of transcriptional regulation. A 60) mRNA is single stranded. A 61) only the + (plus) strand of DNA is transcribed. B 62) only the - (minus) strand of DNA is transcribed. A 63) only the + (plus) strand of DNA is replicated. B 64) only the - (minus) strand of DNA is replicated. B 65) During replication, there is one replicaton fork. B 66) During replication, there are two replication forks. A 67) mRNA contains the four nucleotides, A, T, C, and G. B