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Quiz 4 Part 1

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Justine C.
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10 Questions

What is the difference between a peptide and a protein?

Peptides are made up of linear amino acid chains.

Beta sheets adopt_______

All of the answers are correct

A protein can interact with water and lipds because__________

it has polar and hydrophobic amino acids.

The figure below shows a depiction of an antibody. Which label correctly identifies the region(s) of the antibody that contains variable amino acids for binding of a specific antigen?

A

A glycoprotein ______.

All of the above

The first amino acid to be discovered was______________.

Asparagine from Asparagus in 1806.

Which of the following levels of protein structure involves the interaction of more than one protein into a multi-complex structure?

Quaternary

Hydrogen bonding between NH and C=O groups of every 4th amino acid within the polypeptide backbone results in which type of folding pattern?

α helix (D)

The variable region on the surface of an antibody interacts specifically with an antigen through____.

many weak noncovalent interactions, such as van der Waals interactions and hydrogen bonds

Which of the following represents secondary structures in a protein?

a-helix

Study Notes

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.

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