Multiple Choice
Which of the following lists ranks these molecules in the correct order by size from smallest to largest?
2. Cell Chemistry & Cell Components
Proteins
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The α helix and β pleated sheet represent which level of protein structure?
A
Primary structure
B
Tertiary structure
C
Quaternary structure
D
Pentiary structure
E
Secondary structure
Verified step by step guidance1
Understand that proteins have four levels of structure: primary, secondary, tertiary, and quaternary.
The primary structure of a protein is its unique sequence of amino acids linked by peptide bonds.
The secondary structure refers to the local folded structures that form within a polypeptide due to interactions between atoms of the backbone. The most common types are the alpha (α) helix and beta (β) pleated sheet.
The tertiary structure is the overall three-dimensional shape of a single protein molecule, formed by interactions between the side chains of the amino acids.
The quaternary structure is the structure formed by several protein molecules, usually called protein subunits, which function as a single protein complex.
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