Across
- 3. total amount of living tissue in a trophic level
- 4. cell organelle that stores materials
- 5. substance that speeds up a chemical reaction
- 7. the body's defense against infectious organisms and other invaders
- 9. weak acid/base that can react with strong acids/bases to prevent sudden pH change
- 12. is a series of compounds that transfer electrons from electron donors to electron acceptors via redox reactions, and couples this electron transfer with the transfer of protons across a membrane.
- 14. basic unit of all forms of life
- 16. The framework of the body, consisting of bones and other connective tissues
- 19. inhibition of growth
- 21. relationship where two species live closely together
- 22. reactant of a enzyme-catalyzed reaction
- 23. when an organism engages in ____ respiration when oxygen is present but relies on fermentation in the absence of oxygen
- 24. The portion of a chloroplast where the synthesis of organic molecules from carbon dioxide and water occurs
Down
- 1. full range of physical and biographical conditions where and organism lives and adapts
- 2. the network of nerve cells and fibers that transmits nerve impulses between parts of the body
- 3. process in which forms of matter are passed from one organism to another and from one part of the biosphere to another
- 6. when organism use chemical energy to produce carbohydrates
- 8. a small unit that can join together to form a polymer
- 10. Intracellular digestion of macromolecules by a lysosome
- 11. present in the optic rod cells of the retina
- 13. the center of an atom which contains protons,neutrons and controls cell activities
- 15. An organic compound composed of adenosine and three phosphate groups
- 17. when the concentration of a solute is the same all throughout
- 18. is a soft tissue found in most animals
- 20. an atom with a positive and negative charge