Quiz 4 Part 1

Peptides and Proteins

• A peptide is a short chain of amino acids, whereas a protein is a long chain of amino acids.

Protein Structure

• Beta sheets adopt a pleated sheet conformation.

Protein Interactions

• A protein can interact with water and lipids because of its hydrophilic (water-loving) and hydrophobic (water-fearing) regions.

Antibody Structure

• The variable region of an antibody contains variable amino acids for binding of a specific antigen.
• The correct label for this region is the Fab (fragment, antigen-binding) region.

History of Amino Acid Discovery

• The first amino acid to be discovered was asparagine.

Protein-Protein Interactions

• Quaternary structure involves the interaction of more than one protein into a multi-complex structure.

Hydrogen Bonding and Folding

• Hydrogen bonding between NH and C=O groups of every 4th amino acid within the polypeptide backbone results in an alpha-helix folding pattern.

Antibody-Antigen Interactions

• The variable region on the surface of an antibody interacts specifically with an antigen through complementary shapes and chemical properties.

Secondary Structure

• Alpha helix and beta sheets represent secondary structures in a protein.

Learn about the structure and properties of peptides, proteins, and antibodies, including their interactions and functions.