Cells

3. the sum of all the chemical reactions that occur in living things
4. the term used for anaerobic respiration where sugars are broken down in the absence of oxygen
6. a substance that contains a carbon-hydrogen bond
7. any change to the environment of an organism that produces a response by that organism
8. the process by which molecules of a substance move from areas of high concentration to areas of low concentration of that substance
9. the process by which organisms convert energy, water, and carbon dioxide into glucose and oxygen
10. a long chain of sugar molecules and is very strong and stiff
12. a substance that speeds up or slows down chemical reactions but is not changed by the reaction
13. the process by which simple food substances are broken down and the energy they contain is released
14. the ability of an organism to keep conditions inside the body the same, even though conditions in its external environment change
15. a special type of protein that regulate chemical activities

1. organisms that cannot produce their own food and must eat other organisms to obtain energy
2. some action, movement, or change in behavior of the organism
5. a substance that does not contain both carbon and hydrogen
6. when water moves across a membrane from a region with low solute concentration to a region with high solute concentration
11. organisms that can produce their own food to obtain energy
12. large, rod-shaped molecules made up of nucleic acids (DNA and RNA)