Multiple Choice
Which chemical element is found in both DNA and proteins?
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11. Translation
Proteins
Multiple Choice
Which of the following describes the 3D structure of multiple polypeptide chains in a single protein?
A
Primary structure
B
Secondary structure
C
Tertiary structure
D
Quaternary structure
Verified step by step guidance1
Understand the levels of protein structure: Proteins have four levels of structure - primary, secondary, tertiary, and quaternary.
Primary structure refers to the sequence of amino acids in a polypeptide chain.
Secondary structure involves local folding into structures like alpha-helices and beta-sheets, stabilized by hydrogen bonds.
Tertiary structure is the overall 3D shape of a single polypeptide chain, formed by interactions between side chains.
Quaternary structure describes the 3D arrangement of multiple polypeptide chains in a single protein, indicating how these chains interact and assemble into a functional unit.
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