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The amino acids of the protein keratin are arranged in a helix. This secondary structure is stabilized by A- peptide bonds.B- glycosidic linkages.C- polar bonds.D- covalent bonds.E- hydrogen bonds.
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- Choose all that apply:Which of the following are functions of proteins?A. They catalyze chemical reactions.B. They provide structural support for many animal tissues.C. They transport ions and molecules across cell membranes.D. They play a key role in the contraction of muscles.E. They are the main component of plant cell walls.F. They are the most efficient molecules for storing energy.
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