Biology Review

2. Group of organs that work together to perform a specific function. (two words)
3. A protein that spans the membrane and allows H+ ions to pass through it. (two words)
7. Carry high-energy electrons produced by light absorption in chlorophyll to chemical reactions elsewhere in the cell.
9. Process by which some organisms use chemical energy to produce carbohydrates.
12. The composition of nearly all cell membranes. (two words)
14. Process in which extensions or cytoplasm surround and engulf large particles and take them into the cell.
15. Process by which plants and some other organisms use light energy to convert water and carbon dioxide into oxygen gas and high-energy carbohydrates such as sugars and starches.
16. One of the principal chemical compounds that living things use to store and release energy.
19. Loss of water from a plant through its leaves.
21. Conversion of nitrates into nitrogen gas.

1. Single sugar molecules.
4. Specialized structure that performs important cellular functions within a eukaryotic cell.
5. Weak acid or base that can react with strong acids or bases to help prevent sharp, sudden changes in pH.
6. Electron carrier involved in glycolysis.
8. Process by which organisms maintain a relatively stable internal environment.
9. The process in which cells develop in different ways to perform different tasks. (two words)
10. The granular material you can see in the nucleus.
11. Relationship in which two species live closely together.
13. Large macromolecule formed from monosaccharides.
17. One of two tiny structures located in the cytoplasm of animal cells near the nuclear envelope.
18. Bond formed by the sharing of electrons between atoms.
20. The reactants of enzyme-catalyzed reactions.
22. Process by which a cell releases large amounts of material.
23. The system that provides oxygen needed for cellular respiration and removes excess carbon dioxide from the body.
24. Group of similar cells that perform a particular function.