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Across 4. Specialized cells that provide information about the environment. 5. A protein that catalyzes a specific biochemical reaction. 6. A protein tha B cells of the immune system produce in response to the presence of a nonself antigen; it reacts with the antigen. 7. A protein molecule consists of one or more polypeptide chains. 8. When hydrogen bonds in a protein break, a protein's unique shape may be changed, or ___________. 9. The ___________ of a protein determines its function. 10. A quaternary protein made up of four separate polypeptide chains.

Down 1. The fourth level of conformation that proteins with more then one polypeptide chain have. (2 words) 2. Nitrogen-containing organic compound of joined amino acid molecules. 3. A small organic compound that includes an amino group and a carboxyl group structural unit of a protein molecule. (2 words)