This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Biochemistry
Which of the following is an example of post translational modification ? 
Select and explain. 
A. Gamma carboxylation of glutamate residues, B. N glycosylation of proteins, C. 7 methyl Guanosine capping, D. Poly A tail addition
B: N glycosylation of proteins
Answer: B: N glycosylation of proteins 
Explanation: Ans. is 'a > b' i..e, Gamma carboxylation of glutamate residues, N glycosylation of proteins Impoant post-transcriptional modifications are?7 methyl guanosine capping along 5' end of mRNAPoly A tail addition along 3' end of mRNARemoval of introns and linkage of exons - RNA splicing