What term describes the loss of normal protein shape due to heat or other factors?

• A. Renaturation
• B. Dehydration
• C. Hydrolysis
• D. Denaturation

Answer: (D)

Loss of normal protein shape due to heat or other factors is called denaturation. Proteins fold into specific shapes that are stabilized by various weak bonds and interactions, like hydrogen bonds, ionic interactions, and hydrophobic effects. When heat or harsh conditions disrupt these interactions, the protein unfolds and loses its functional shape. In some cases, if the original conditions are restored, a protein can refold toward its native structure—that recovery is renaturation. The other terms don’t describe the general process: hydrolysis means breaking peptide bonds to make smaller molecules, dehydration refers to removing water and can affect structure but isn’t the basic term for shape loss, and renaturation describes the regain of structure, not the initial loss.