Your body contains tens of thousands of different proteins, each with a specific structure and function. the unique shape of each of these diverse proteins is based on several superimposed levels of structure. which of the following statements is true?
a. the primary structure of a protein is the order of nucleic acids in a polypeptide.
b. the 20 amino acids found in proteins differ in the composition of their r groups, which may be either polar or charged.
c. tertiary structure is the overall shape of a polypeptide, which may be stabilized by hydrophobic interactions, hydrogen bonds, ionic bonds, and covalent bonds
d. quaternary structure is only found in proteins that have four identical polypeptide subunits.
e. secondary structures, which include the alpha helix or beta pleated sheet, are held together by interactions between r groups.

a. The primary structure of a protein is the order of nucleic acids in a polypeptide.  FALSE. THE PRIMARY STRUCTURE OF A PROTEIN IS THE ORDER OF THE AMINO ACIDS ON IT.

b. The 20 amino acids found in proteins differ in the composition of their R groups, which may be either polar or charged.  TRUE. AND THERE ARE MORE SUB CATEGORIES LIKE AROMATIC, POSITIVELY CHARGED AND NEGATIVELY CHARGED.

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

d. Quaternary structure is only found in proteins that have four identical polypeptide subunits.  FALSE. QUATERNARY STRUCTURE IS FOUND IN PROTEINS THAT HAVE TWO OR MORE POPYPEPTIDE SUBUNITS, AND THEY DOES NOT NEED TO BE IDENTICAL.

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

Explanation: