Becker's World of the Cell 9th Edition by Lewis Kleinsmith, Jeff Hardin, Gregory Paul Bertoni

Exercise 4

More Sleuthing Using Mutants. You identify three independent missense mutations that all affect the same gene. In fact, all three mutations affect the same codon but do not cause the same amino acid substitution. The first mutation results in substitution of arginine (Arg), the second results in substitution of tyrosine (Tyr), and the third results in substitution of glutamine (Gln). Each mutation affects just a single base within this codon but not necessarily the same base. What was the original amino acid