Which class of
macromolecules does DNA
and RNA belong?

Nucleic acids

Explanation:

Nucleic acids, macromolecules made out of units called nucleotides, come in two naturally occurring varieties: deoxyribonucleic acid (DNA) and ribonucleic acid (RNA).

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where in your body is there an enzyme that does function at a high or low ph? what is the name of that enzyme and its function?