Exam 4: Proteins: Three-Dimensional Structure and Function

Which structure below indicates the proper hydrogen-bonding pattern between amino acids in an α-helix? (Dashed lines represent the hydrogen bonds. )

Once denatured,proteins cannot be renatured or restored to the native state.

A protein has a molecular weight of 5600 daltons;its subunits are about 1960 daltons.There are ________ protein chains per oligomer.

A β-sandwich forms when

All amino acids can readily interconvert between the cis and trans forms by rotation about the peptide bond.

NMR is often used for the determination of the ________ of proteins.

Which statement is NOT true about an α-helix?

The subunits of a multisubunit proteins are always identical.

The association of hydrophobic side chains in the interior of proteins helps to stabilize helices and pleated sheet domains.

Antibodies bind antigens at

NMR has the advantage of using proteins in solution,but it is difficult to determine the structures of very large proteins with this technique.

For each term select the description that best describes its contribution to the structure of collagen. -Vitamin C

In peptide bonds,the bonds between

α-helices easily form on the surface of water-soluble proteins due to the stabilizing effect of hydrogen bonding with water.

Which is evidence that structures for proteins determined by X-ray crystallography represent the structures in solution?

For each term select the description that best describes its contribution to the structure of collagen. -Proline

Ramachandran determined the "allowed" values of the phi and psi angles primarily by considering ________.

Proteomics is

Proteins segments which fold first can promote the folding of other sections of the protein into the native conformation by a process known as

Which statement is false about a globular protein that performs its biological function as a single independent polypeptide chain?