Which of the following statements is an accurate description of proteins? A. The

Question

Which of the following statements is an accurate description of proteins?

A. The primary structure of a protein is the order of amino acids in a polypeptide, as coded for in the DNA of a gene.

B. The 20 amino acids found in proteins differ in the composition of their R groups, which may be either polar or charged.

C. Secondary structures, which include the alpha helix or beta pleated sheet, are held together by interactions between R groups.

D. Tertiary structure is the overall shape of a polypeptide, which may be stabilized by hydrophobic interactions, hydrogen bonds, ionic bonds, and peptide bonds.

E. Quaternary structure is only found in proteins that have four identical polypeptide subunits.

I already tried third answer and that was wrong. I'm thinking it could be the first answer but I am not 100% sure. Thanks in advance, and any helpful explanation for future reference will be greatly appreciated.

Explanation / Answer

An accurate description of proteins is the primary structure of a protein is the order of amino acids in a polypeptide, as coded for in the DNA of a gene. This is because each protein is specific in its amino acid sequence and hence can be best described by the primary structure.

Option A is correct.

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