H

Short polymer

Subunit (monomer)

Figure 2.12 The Synthesis and Breakdown of Polymers (a) Subunits are joined (polymerized) by removal of water, a dehydration reaction. (b) In the reverse reaction, hydrolysis, the addition of water breaks bonds between the subunits.These reactions take place in the formation of many different polymers (macromolecules).

2.4 Proteins and Their Functions 25

■ Name the four important classes of large molecules in cells.

■ In pure water, what must be done to decrease the OH: concentration? To decrease the H+ concentration?

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