Organic chemistry question about polymers

Question

Nylon is a synthetic polymer, but the chemical bond between the monomer units is the same type of bond that links the monomer units in silk, hair, and wool. These natural polymers are proteins made by joining amino acid monomers together. In amino acids, both the acid and amino groups are on the same molecule. How might having the two reacting groups on completely different molecules avoid complications for a synthetic chemist?

Please help!

Answer 1

With aa's, you can make, for example, ser-cys-ala, or it could come out ala-ser-cys, etc. This is dealt with in biological systems using a template mRNA that defines the order.

With nylon, it's adipic acid and hexamethylene diamine. The adipic acid has carboxylic acid groups at both ends. The hexamethylene diamine has amino groups at both ends, so, each will attach to the other in a predictable order.