Biology Review

1. Bond formed by the sharing of electrons between atoms.
2. One of the principal chemical compounds that living things use to store and release energy.
3. The composition of nearly all cell membranes. (two words)
7. The process in which cells develop in different ways to perform different tasks. (two words)
10. 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.
14. Electron carrier involved in glycolysis.
16. Process by which some organisms use chemical energy to produce carbohydrates.
18. The system that provides oxygen needed for cellular respiration and removes excess carbon dioxide from the body.
20. The granular material you can see in the nucleus.
21. Relationship in which two species live closely together.
22. Carry high-energy electrons produced by light absorption in chlorophyll to chemical reactions elsewhere in the cell.

1. One of two tiny structures located in the cytoplasm of animal cells near the nuclear envelope.
2. A protein that spans the membrane and allows H+ ions to pass through it. (two words)
4. Conversion of nitrates into nitrogen gas.
5. Process by which a cell releases large amounts of material.
6. Specialized structure that performs important cellular functions within a eukaryotic cell.
8. Large macromolecule formed from monosaccharides.
9. Loss of water from a plant through its leaves.
10. Process in which extensions or cytoplasm surround and engulf large particles and take them into the cell.
11. Group of similar cells that perform a particular function.
12. The reactants of enzyme-catalyzed reactions.
13. Process by which organisms maintain a relatively stable internal environment.
15. Weak acid or base that can react with strong acids or bases to help prevent sharp, sudden changes in pH.
17. Single sugar molecules.
19. Group of organs that work together to perform a specific function. (two words)