Biology Vocabulary

6. Two simple sugars.
7. An ___ is an atom or molecule that has a net electrical charge.
8. A place where anything is kept in store; especially, a place where water is collected and kept for use when wanted.
9. __________ is the part of the metabolism responsible for breaking complex molecules down into smaller molecules.
13. Surface ______ is water that flows over the land surface, and it is a major component of the water cycle.
14. The change of a gas to its liquid or solid form.
15. Organic compounds that contain four rings of carbon atoms.
17. Monomers of nucleic acid.
19. The state of steady internal physical and chemical conditions maintained by living systems.
20. A community of plants and animals that have common characteristics for the environment they exist in.

1. An ester derived from glycerol and three fatty acids.
2. Involving neither organic life nor the products of organic life.
3. Water that falls from the clouds towards the ground, especially as rain or snow.
4. __________ is the set of metabolic pathways that construct molecules from smaller units.
5. Proteins and DNA are natural ______.
10. The sticking together of alike molecules.
11. Substances that can be mixed with or dissolved in water.
12. The substance inside a cell which surrounds the cell's nucleus
16. Sugar contains in the milk.
18. A large, structural polysaccharide made from chains of modified glucose.