Question

proteins acts as buffers because they ________. help emulsify fats help maintain a constant ph facilitate chemical reactions help protect against plaque buildup

Explanation:

Buffers resist pH changes. Proteins have ionizable groups that can either release or bind hydrogen ions, thus maintaining a constant pH. Emulsifying fats is a function of substances like bile salts. Facilitating chemical reactions is a role of enzymes (though some proteins can be enzymes, but not the reason for buffering). Protecting against plaque buildup is not related to the buffering property of proteins.

Answer:

help maintain a constant pH