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Across 2. Cells that need steady supply of adenosine triphosphate 4. Subtance made of the bonded atoms of two or more different elements 9. Substance made up of atoms that have the same number of protons 12. Molecules made of amino acids 14. Molecule make of three parts: a sugar, a base, and a phosphate group 15. A long chain of nucleotide units 17. Atom or groups of atoms that has an electric charge 18. Building Blocks that link to form proteins 19. Electrons in the outermost level, or shell 20. Substance that reacts to prevent pH changes in a solution 21. Contains the sugar ribose 23. A mixture in which ions or molecules of one or more substance are evenly distributed in another substance 24. Attraction or particles of the same substance 25. Compound that form extra hydroxide ions when dissolved in water

Down 1. New substance that is formed 2. Smallest unit of matter that cannot be broken down by chemical means 3. The shape of the active site determines which reactants 5. Measure of how acidic or basic a solution is 6. Group of atoms held together by covalent bonds 7. Fats, phospholipids, steroids, and waxes 8. The reaction is the minimum kinetic energy that colliding particles need to start a chemical reaction 9. Molecule that increases the speed of biochemical reactions 10. Molecule made of sugar 11. The region where the reaction takes place 13. Contains the sugar deoxyribose 16. Substance that is changed in a chemical reaction 18. Attraction between particles of different substance 22. Compounds that form extra hydronium ions when dissolved in water