AP Biology Flashcards: Proteins
Written by AP Content Team, Verified for 2026 AP Exams, Last updated: July 2026
Review key ideas with interactive flashcards. This set includes 16 cards to help you master important concepts.
What type of chemical bond is responsible for forming secondary structures?
Secondary structures result from hydrogen bonds that form in the polypeptide backbone.
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What type of chemical bond is responsible for forming secondary structures?
Secondary structures result from hydrogen bonds that form in the polypeptide backbone.
What is the key difference between the forces that create secondary and tertiary structures?
Secondary structure is formed by hydrogen bonds in the polypeptide backbone, while tertiary structure is formed by interactions between the R groups.
What ultimately determines a protein's function?
The function of a protein is collectively determined by all four levels of its structure.
What is the secondary structure of a protein?
Secondary structure in proteins involves local folding of the polypeptide chain into alpha-helices and beta-pleated sheets.
What are proteins?
Proteins are linear chains of amino acids linked by covalent peptide bonds.
What is the tertiary structure of a protein?
Tertiary structure is the overall three-dimensional shape of a protein, formed by interactions between R groups.
What types of interactions stabilize a protein's tertiary structure?
Tertiary structure is formed by interactions between R groups, such as hydrogen bonds, ionic bonds, and disulfide bridges.
What is the primary structure of a protein?
The primary structure is the sequence of amino acids in a polypeptide chain.
Describe the basic structure of an amino acid.
An amino acid consists of a central carbon atom bonded to a hydrogen, a carboxyl group, an amine group, and a variable R group.
What is a peptide bond?
A peptide bond is a covalent bond formed between the carboxyl group of one amino acid and the amine group of another.
What part of an amino acid determines a protein's specific characteristics?
The chemical properties of the variable R group determine the protein's structure and function.
A protein consists of four separate polypeptide chains. Which is the highest level of structure this protein possesses?
Since the protein consists of multiple polypeptide subunits, it possesses a quaternary structure.
Name the two common forms of protein secondary structure.
The two common forms of secondary structure are alpha-helices and beta-pleated sheets.
If a mutation altered the amino acid sequence of a protein, which level of structure would be directly affected?
A change in the amino acid sequence would directly affect the primary structure of the protein.
Define quaternary structure.
Quaternary structure arises from the interaction of multiple polypeptide subunits.
How does the primary structure influence a protein's final form?
The sequence of amino acids in the primary structure ultimately determines the protein's overall shape.