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Across 5. Which of the following is an enzyme? Melanin, hemoglobin, cholinesterase, myosin 8. Group of macromolecules to which enzymes belong. 14. Recognized by its ring-like structure. 15. Of these, the one that is the monosaccharide: fructose, starch, cellulose. 17. You are lactose intolerant and a friend gives you a glass of "lactose-free milk." You test it with a glucose test strip you have in your pocket and find it tests negative for glucose. Should you drink the milk? Yay or nay? 18. Function is insulation, making cell membranes, and long term energy storage. 19. Building block of nucleic acids (like DNA).

Down 1. Monomer of proteins. 2. In the lactose/lactase reaction, this is the substrate. 3. Monomer (building block) of carbohydrates. 4. When an enzyme's shape is changed due to heat or pH changes. 6. Macromolecule that contains the most stored energy. 7. Monomers build ____________. Hint: think "poly" 9. Lipids that contain the maximum number of hydrogens and are solid at room temp. 10. Building blocks of lipids include _______ and three fatty acids. 11. Water is needed in order to break bonds between molecules. 12. The type of reaction that takes place when you build polymers and water is released. 13. Living things have these in order to resist drastic changes in pH. 16. Chemicals that lower the activation energy of a reaction and act as a calalyst.