Which term describes the process by which unfolded protein molecules bond to form a firm network and set in foods?

• A. Coagulation
• B. Denaturation
• C. Gelatinisation
• D. Syneresis

Answer: (A)

When foods containing proteins are heated, their proteins first denature, meaning they unfold. The key idea here is what happens after unfolding: the unfolded protein molecules start to bond with one another and form a three‑dimensional network that traps water and stiffens the mixture, causing it to set. That bonding and network formation is coagulation. Denaturation describes just the unfolding step, not the network that creates the firm structure. Gelatinisation involves starch swelling with heat, not protein networks. Syneresis is the expulsion of liquid from a gel. So the process that describes proteins bonding to form a firm network and setting is coagulation.