Multiple Choice
What is the monomer unit of a protein?
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4. Biomolecules
Proteins
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Which characteristic of a protein will remain intact if the protein is denatured?
A
Primary structure
B
Secondary structure
C
Quaternary structure
D
Tertiary structure
Verified step by step guidance1
Understand what denaturation means: Denaturation is the process where a protein loses its native structure due to external stress like heat, pH changes, or chemicals, without breaking peptide bonds.
Identify the levels of protein structure: Proteins have four levels of structure - primary, secondary, tertiary, and quaternary.
Define primary structure: The primary structure of a protein is its unique sequence of amino acids linked by peptide bonds. This sequence is determined by the genetic code.
Consider the effects of denaturation: Denaturation affects the higher levels of protein structure (secondary, tertiary, and quaternary) by disrupting hydrogen bonds, ionic bonds, and hydrophobic interactions, but it does not break peptide bonds.
Conclude which structure remains intact: Since denaturation does not break peptide bonds, the primary structure, which is the sequence of amino acids, remains intact even when a protein is denatured.
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