AP Biology Unit 1.5: Protein Structure

Front

What is the primary structure of a protein?

Back

The primary structure of a protein is the linear sequence of amino acids linked by peptide bonds.

Front

What type of bond is formed between two amino acids during protein synthesis?

Back

A peptide bond is formed between two amino acids during protein synthesis.

Front

What is the secondary structure of a protein?

Back

The secondary structure refers to the local folding of the polypeptide chain into structures such as alpha helices and beta sheets, stabilized by hydrogen bonds.

Front

What is the tertiary structure of a protein?

Back

The tertiary structure is the overall three-dimensional shape of a polypeptide, determined by interactions among R-groups, including disulfide bridges, hydrogen bonds, and ionic bonds.

Front

What is the quaternary structure of a protein?

Back

The quaternary structure is formed when two or more polypeptide chains come together to form a functional protein.

Front

Define hydrophobic interactions in protein structure.

Back

Hydrophobic interactions occur when nonpolar R-groups of amino acids cluster together in the interior of a protein to avoid contact with water.

Front

What is the role of disulfide bridges in protein structure?

Back

Disulfide bridges are covalent bonds that stabilize the tertiary and quaternary structures of proteins by linking cysteine residues.

Front

What is the significance of hydrogen bonds in protein structure?

Back

Hydrogen bonds help stabilize the secondary structure of proteins, such as alpha helices and beta sheets.

Front

What is the difference between hydrophobic and hydrophilic R-groups?

Back

Hydrophobic R-groups are water-repelling and tend to fold inward in proteins, while hydrophilic R-groups are water-attracting and tend to be on the surface.

Front

What is a dehydration/condensation reaction in the context of protein synthesis?

Back

A dehydration/condensation reaction is the process by which two amino acids are joined together, releasing a water molecule and forming a peptide bond.