Question

b. polymers are assembled and broken down in two types of reactions: dehydration synthesis and hydrolysis. which kind of reaction is this? c. is c₆h₁₂o₆ (glucose) a monomer or a polymer? d. to summarize, when two monomers are joined, a molecule of ___ is always removed.

Explanation:

b. Polymers are assembled by dehydration synthesis (removing water to form bonds between monomers) and broken - down by hydrolysis (using water to break bonds). Without more context about the "this" in the question, if referring to assembly, it's dehydration synthesis; if to breakdown, it's hydrolysis.
c. Glucose ($C_6H_{12}O_6$) is a monomer as it can combine with other glucose molecules to form polymers like starch or cellulose.
d. When two monomers are joined in a dehydration synthesis reaction, a molecule of water ($H_2O$) is removed.

Answer:

b. If assembly: Dehydration synthesis; if breakdown: Hydrolysis
c. Monomer
d. Water ($H_2O$)