You are studying an e. coli gene that specifies a protein. a part of its sequence is: –ala–pro–trp–ser–glu–lys–cys–his– you recover a series of mutants for this gene that show no enzymatic activity. by isolating the mutant enzyme products, you find the following sequences: mutant 1: –ala–pro–trp–arg–glu–lys–cys–his– mutant 2: –ala–pro– mutant 3: –ala–pro–gly–val–lys–asn–cys–his– mutant 4: –ala–pro–trp–phe–phe–thr–cys–his– what is the molecular basis for each mutation? what is the dna sequence that specifies this part of the protein?