Proteins are described as polymers because they are
- A. large molecules built from repeating amino acid units
- B. made of two identical halves
- C. always branched
- D. insoluble in all solvents
Explanation
A polymer is any large molecule assembled from many small repeating units, and in a protein those units are amino acids joined by peptide bonds. Unlike a synthetic polymer, the sequence is precisely specified rather than random, which is what allows a protein to have a defined function. Polysaccharides and nucleic acids are the other biological polymers.
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