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Multiple Choice
The "primary structure" of a protein refers to __________.
A
the α helix or β pleated sheets
B
interactions among the side chains or R groups of the amino acids
C
coiling due to hydrogen bonding between amino acids
D
the weak aggregation of two or more polypeptide chains into one functional macromolecule
E
the sequence of amino acids along a polypeptide chain
Verified step by step guidance
1
Understand that proteins have different levels of structure: primary, secondary, tertiary, and quaternary.
The primary structure of a protein is the linear sequence of amino acids in a polypeptide chain. This sequence is determined by the genetic code.
Recognize that the primary structure is crucial because it dictates the higher levels of protein structure, which ultimately determine the protein's function.
The secondary structure involves local folding into structures like α helices and β pleated sheets, stabilized by hydrogen bonds.
Tertiary and quaternary structures involve further folding and interactions, such as those among side chains (R groups) and the aggregation of multiple polypeptide chains, respectively.