Post- translational modifications include all of the following EXCEPT
A) formation of covalent bonds between cysteine residues of the amino acid site chains.
B) removal of introns.
C) addition of carbohydrates to form a glycoprotein.
D) formation of hydrogen bonds among carbonyl and amino groups of the polypeptide backbone.

Question

Quizplus · Accepted Answer

Post-translational modifications refer to any changes made to a polypeptide after it has been synthesized. Therefore, the removal of introns, which occurs during the pre-mRNA splicing process prior to translation, is not a form of post-translational modification. The other options (formation of covalent bonds, addition of carbohydrates to make a glycoprotein, and formation of hydrogen bonds) are all examples of post-translational modifications.

Post- Translational Modifications Include All of the Following EXCEPT