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Across 4. broken apart by hydrolysis. 5. the stuff that make up our bodies, the bodies of other organisms, and the physical environment. 7. the tendency of particles to spread out evenly in an available space. 8. is a single polynucleotide chain. 12. used to take in large molecules. 14. It is called building blocks of polymers. 15. It includes cholesterol and some hormones. 16. catalysts that decrease the activation energy needed for a reaction to begin, without being consumed by the reaction. 17. diverse hydrophobic (water-fearing) compounds composed largely of carbon and hydrogen.

Down 1. the smallest unit of matter. 2. a substance consisting of two or more different elements in a fixed ratio. 3. are digestive compartments within a cell. 5. It is structural, found in plant cell walls. 6. used to export bulky molecules, such as proteins or polysaccharides. 7. a double helix. 8. a cellular particle made of RNA and protein that serves as the site for protein synthesis in the cell. 9. - involved in nearly every dynamic function in your body and are very diverse. 10. a substance that cannot be broken down to other substances. 11. large vesicles that have a variety of functions. 13. a molecules with the same chemical formula but have different structures, which creates different properties in the molecules.