$2.(18$ points$)$ Predict the phenotype for expression of the E$.$ coli trp operon enzymes $($in both Trp excess and Trp limited conditions$)$ for the following mutants: a$)$ C to G substitution at nucleotide $22$ of the trp operon leader RNA. b$)$ Deletion of C at nucleotide $22$ of the trp operon leader RNA.