Genetics: Analysis and Principles 5th Edition by Robert Brooker

Exercise 31

Lactose permease of E. coli is a protein composed of a single polypeptide that is 417 amino acids in length. By convention, the amino acids within a polypeptide are numbered from the amino-terminus to the carboxyl-terminus. Are the following questions about lactose permease true or false
a. Because the 64th amino acid is glycine and the 68th amino acid is aspartic acid, the codon for glycine, 64, is closer to the 3 end of the mRNA than the codon for aspartic acid, 68
b. The mRNA that encodes lactose permease must be greater than 1241 nucleotides in length.