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Question

I had a test earlier today and there was this question that I just could not figure out. Question:

All of the following are examples of post-translational modification except:

a. joining of two or more subunits to form a quaternary structure
b. attachment of sugars, lipids or phosphate groups
c. division of the chain into sections
d. removal of primers


I do not want to have to wait until next week to find out the answer to the question, so could someone help me out please? Thanks.

Answer 1

c. division of the chain into sections

Some enzymes such as trypsin are released in the inactive forms. Subsequent activation is not considered post-translational modification, because modification is done at the Golgi apparatus before it is released.