Environmental Science

5. organic substances that are insoluble in water, soluble in organic solvents, are related to fatty acids and are utilized by the living cell
7. another class of indispensable biomolecules, which make up around 50 percent of the cellular dry weight
8. physical substance that occupies space and possesses rest mass, especially as distinct from energy
9. is a nonmetallic chemical element with atomic number 6
12. is a nonmetal chemical element with the symbol H and atomic number 1
14. each of more than one hundred substances that cannot be chemically interconverted or broken down into simpler substances and are primary constituents of matter
15. most essential organic molecules, which are involved in the maintenance and metabolic processes of living organisms

1. a poisonous, combustible nonmetal that exists in two common allotropic forms
2. chemically defined as polyhydroxy aldehydes or ketones or compounds which produce them on hydrolysis
3. a combination of atoms joined by chemical bonds
4. a colorless, odorless unreactive gas that forms about 78 percent of the earth's atmosphere
6. deoxyribonucleic acid
10. a colorless, odorless reactive gas, the chemical element of atomic number 8 and the life-supporting component of the air
11. acids refer to the genetic material found in the cell that carries all the hereditary information from parents to progeny
13. ribonucleic acid
16. a non metallic chemical element with the symbol S and atomic number 16