The weak polar bonds of water molecules are responsible for the many properties of water required for life on earth. The degree of acidity of water is also an important property in biological systems. Macromolecules consist of many repeating subunits, each subunit being similar or identical to the other subunits.

■ Why is water a polar molecule? Give three examples of why this property is important in microbiology.

(a) Dehydration Synthesis

Short polymer

Subunit (monomer)

Longer polymer H2O

(b) Hydrolysis

(hydrolytic reaction) N f

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