A protein is a chain of

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BlackTom AI · Accepted Answer

Question restatement: The prompt asks what a protein is a chain of, and provides four options to choose from.
Option 1: Carbons — This is incorrect as the fundamental monomer units of proteins are not carbons themselves; proteins are polymers built from amino acids, which contain carbon atoms, but the phrase 'chain of carbons' does not describe proteins' basic building blocks.
Option 2: Hydrogens — While hydrogen atoms are present in amino acids and proteins, a protein is not defined as a chain of hydrogen atoms. Proteins are defined by their repeating units formed by peptide bonds between amino acids, not by a chain of hydrogen atoms.
Option 3: Amino acids — This is correct. Proteins are polymers composed of amino acids linked together by peptide bonds to form polypeptide chains that fold into functional three-dimensional structures.
Option 4: Nucleic acids — This is incorrect because nucleic acids (DNA and RNA) are distinct biopolymers made of nucleotides, not amino acids. They encode genetic information, whereas proteins perform structural and enzymatic roles.
Synthesis: To identify the correct choice, recall that the fundamental building blocks of proteins are amino acids, which join via peptide bonds to create polypeptide chains. The other options misrepresent what proteins are composed of or confuse with other biomolecules. The key distinction lies in recognizing amino acids as the monomers of proteins, not carbons, hydrogens, or nucleic acids.

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A protein is a chain of

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