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The carbon-containing compounds that cells are composed of include nucleic acids, carbohydrates, phospholipids, and proteins. Each of these compounds is​ composed of monomers that are linked together into polymers. Proteins are composed of amino acid monomers linked together into peptides and proteins (polymers).

Which of the following contribute to the primary structure of a protein?


Covalent peptide bonds between amino acids.


Non-covalent hydrogen-bonding between amino acid R-groups.


Covalent bonding between –SH-containing​ amino acids.


Non-covalent hydrophobic bonding between nonpolar amino acids.

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