Which of the following is an example of post-translational modification?: (A) Glutamate to Glutamine, (B) Proline to Hydroxyproline, (C) Aspaate to Asparagine, (D) Leucine to Isoleucine
Answer is B. Proline has its own codons, hydroxy proline does not have. hydroxyproline is formed from proline by post-translational modification. Glutamate to glutamine is mutation, not post-translational modification. The same is true for option c and d.