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Across 1. any of a class of natural or synthetic substances composed of very large molecules, called macromolecules, that are multiples of simpler chemical units called monomers 4. substance that exist before a chemical reaction starts 6. substance that realeses hydrogen ions when dissolved in water 7. particle without a charge in an atoms nucleus 9. organic compound made of amino acids joined by peptide bonds 11. building block of matter contains subatomic particles neutrons protons and electrons

Down 2. combination of two or more different substances in which each substance keeps its individual characteristics 3. substance formed by chemical reaction 5. substance that releases hydroxide ions when dissolved in water 8. hydrophobic biological molecule composed mostly of carbon and hydrogen 9. positively charged particle in an atoms nucleus 10. protein that speeds up a biological reaction by lowering the activation energy needed to start the reaction