see there are 2 types of polymerization ... 
1) condensed polymerization (2) Natural polymers 
now cond. are also called synthetic ply. meaning fake .... 
there are 2 type 
(a) nylon - amide linkage 
(b) polyester - ester linkage 
Natural poly. 
(a) Protein - amide linkage 
(b) fats and oils - ester linkage 
(c) Carbohydrates .... it has no linkage ... it forms [ - O - box - O - box - ]
hope it helped