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Across 4. This ion is necessary for conduction of electrical impulses 6. A long chain of simple sugars 9. Salts are ______________ compounds 10. What does DNA stand for? 12. The macromolecule that includes DNA and RNA 17. Release OH- ions when dissociated in water 19. Sucrose is this type of sugar 21. The base which RNA has that DNA does not have 24. _______________ conduct electrical impulses in the nervous system 27. ___________ proteins are stable and insoluble in water 28. Glucose is this type of sugar 29. The most abundant protein in the body 31. Component of a solution that is present in greatest amount 34. Atoms with the same number of protons but different number of neutrons 35. What type of sugar is part of RNA? 36. This type of protein plays a crucial role in immunity, growth and development 38. charged atoms resulting from the gain or loss of electrons 39. A heavy metal found in the body

Down 1. Smallest component of a compound that retains its properties 2. What does ATP stand for? 3. Has a pH range of 7.35-7.45 5. Have a pH range of 0-6.99 7. Equal to the number of protons in an atom 8. The structure of a protein that is composed of a-helices and B-pleated sheets 11. The macromolecule that is makes up sugars and starches 13. Ions that are positive because they have lost one or more electrons 14. The building blocks of proteins 15. Carbohydrates are stored in the liver as this: 16. The type of lipid found in the cell membrane 18. The buffering system works in the ____________ and lungs 20. Neutral subatomic particle 22. The macromolecule that plays many roles in the body including functioning as enzymes 23. Many plasma proteins act as these: 25. All organic compounds must contain this element 26. The property of water that protects our internal organs from damage 30. The macromolecule that is makes up fat 32. The base which DNA has that RNA does not have 33. Enzymes work to ______________ the activation energy required to start a reaction 37. Source of immediately usable energy for the body processes