USMLE Step 1 Forum
The DNA sequence M, shown below, is the sense strand from a coding
region known to be a mutational “hot spot” for a gene. It encodes amino
acids 21 to 25. Given the genetic and amino acid codes CCC = proline (P),
GCC = alanine (A), TTC = phenylalanine (F), and TAG = stop codon,
which of the...