cells

4. A structure having an uneven distribution of electron density
6. an article or substance that is manufactured or refined for sale.
7. a compound consisting of a nucleoside linked to a phosphate group
8. a substance that increases the rate of a chemical reaction
12. the diffusion of water
14. a substance produced by a living organism
16. any of a large group of organic compounds that includes sugars, starch, and cellulose,
17. facts and statistics collected together for reference or analysis.
18. a molecule containing a very large number of atoms

1. a molecule that can be bonded to other identical molecules to form a polymer.
2. a group of living organisms consisting of similar individuals capable of exchanging genes or interbreeding
3. that contain equal numbers of protons but different numbers of neutrons in their nuclei
5. a substance that takes part in and undergoes change during a reaction.
6. any of a class of nitrogenous organic compounds
9. any of a class of organic compounds that are fatty acids
10. having assets in excess of liabilities; able to pay one's debts.
11. a substance that has a molecular structure consisting chiefly
13. an underlying substance or layer.
15. a means of solving a problem or dealing with a difficult situation.