Living Environment

5. the basic unit of structure and function that makes up organisms.
6. proteins that speed up the rate of chemical reactions in living things.
8. a type of cell division that results in two daughter cells each having the same number and kind of chromosomes as the parent nucleus, typical of ordinary tissue growth
9. a life process that involves combining simple substances into more complex substances.
12. any one of several building blocks of protein.
14. a type of molecule that does not contain both carbon and hydrogen but can contain any other combination of elements.
15. the flow of materials within a cell as well as between the parts of a multicellular organism.
19. all the chemical reactions that occur within the cells of an organism.
21. a structure within the cell that carries out a specific function.
22. an organelle found in large numbers in most cells, in which the biochemical processes of respiration and energy production occur
23. the movement of molecules from areas of high concentration to areas of low concentration.

1. a chemical produced in the endocrine glands.
2. storage sacs within the cytoplasm of a cell that may contain either wastes or useful materials, such as water or food.
3. the process by which organisms produce new organisms of the same type.
4. the ability of an organism to maintain a stable internal environment even when the external environment changes.
7. the process in which nutrients are broken apart, releasing the chemical energy stored in them.
10. the jellylike substance that is between the cell membrane and the nucleus and that contains specialized structures.
11. term used to describe molecules that contain both hydrogen and carbon.
13. tiny structures in the cell that are the sites of protein production.
16. an insoluble substance which is the main constituent of plant cell walls and of vegetable fibers such as cotton. It is a polysaccharide consisting of chains of glucose monomers.
17. green organelles that contain chlorophyll; where photosynthesis takes place.
18. the process that breaks down large food molecules into simpler molecules that the organism can use.
20. a large structure within a cell that controls the cell's metabolism and stores genetic information, including chromosomes and DNA.