What type of reactions creates bonds between monomers? What type of bond breaks bonds between monomers?

dehydration synthesis reactions and hydrolysis.

Explanation:  

Large biological molecules often assemble via dehydration synthesis reactions, in which one monomer forms a covalent bond to another monomer, releasing a water molecule in the process.

The process of splitting the bond between monomers is called hydrolysis.  Since a water molecule was lost during dehydration synthesis, hydrolysis brings the water back.

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