Chemical Reactions, Grades 9-12 Complex chemical reactions take place constantly in our bodies. Students discuss how high temperatures and pH changes could be dangerous to proteins in the human body. Chemical reactions in living systems are catalyzed by protein molecules called enzymes. Structure and Properties of Matter, Grades 9-12 Carbon atoms bond to form a variety of structures, including molecules that are essential to life. Proteins are one class of these biochemical molecules.
Students discuss the role of proteins in living things.
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