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Across 1. C6H12O6; blood sugar 3. steroids with four hydrocarbon rings; animal products; made by liver 6. building blocks of proteins, joined by peptide bonds 8. made from phosphorus group, glycerol, 2 fatty acids; forms membrane bilayer 9. contains (+) ions and (-) ions, not H+ or OH- 10. HCO3-; buffer in blood 14. building blocks of DNA and RNA 15. made from glycerol and 3 fatty acids 17. reactions in which food is metabolized for energy; electrons are exchanged 19. found in foods and made by intestinal bacteria; necessary for blood clotting 21. bond that explains surface tension; bond between DNA base pairs 22. non-protein portion of an enzyme 27. table sugar; fructose-glucose disaccharide 28. NH3; common waste product of protein breakdown 29. animal glucose storage; found in muscle and liver 30. bitter; proton acceptors; release OH-

Down 2. transport fatty acids and cholesterol in blood 3. CH2O; sugars and starches 4. number of neutrons within the element varies 5. phosphate bonds are hydrolyzed to liberate energy for reactions in cell 7. milk sugar; galactose-glucose disaccharide 8. molecule with unequal electron sharing 11. triglycerides, phospholipids, steroids 12. breakdown product of cholesterol; aid fat digestion and absorption 13. conducts electrical current in solution 16. number of protons is the same for all atoms 18. in orange pigmented vegetables and fruits; retinal part of photoreceptor in eyes 20. -log[H+]; a measure of acid-base 22. hormone necessary for maintaining blood glucose levels 23. sour; releases H+ ions (proton donor) 24. Avogadro's number 25. biological catalyst 26. positive ion; lost electrons