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Across 7. a process that involves rearrangement of the molecular or ionic structure of a substance, as opposed to a change in physical form or a nuclear reaction. 10. (in green plant cells) a plastid that contains chlorophyll and in which photosynthesis takes place. 12. the cycle of enzyme-catalyzed dark reactions of photosynthesis that occurs in the chloroplasts of plants and in many bacteria and that involves the fixation of carbon dioxide and the formation of a 6-carbon sugar. 13. the natural coloring matter of animal or plant tissue. 16. an organism that is able to form nutritional organic substances from simple inorganic substances such as carbon dioxide. 17. an article or substance that is manufactured or refined for sale. 21. the process by which green plants and some other organisms use sunlight to synthesize foods from carbon dioxide and water. 22. the minimum quantity of energy that the reacting species must possess in order to undergo a specified reaction.

Down 1. the chemical breakdown of a substance by bacteria, yeasts, or other microorganisms, typically involving effervescence and the giving off of heat. 2. a green pigment, present in all green plants and in cyanobacteria, responsible for the absorption of light to provide energy for photosynthesis. Its molecule contains a magnesium atom held in a porphyrin ring. 3. power house of the cell 4. relating to, involving, or requiring an absence of free oxygen. 5. a substance that takes part in and undergoes change during a reaction. 6. light from the sun. 7. a set of metabolic reactions and processes that take place in the cells of organisms to convert biochemical energy from nutrients into adenosine triphosphate 8. people breath it out 9. relating to, involving, or requiring free oxygen. 11. an organism deriving its nutritional requirements from complex organic substances. 14. h2o 15. a substance or layer that underlies something, or on which some process occurs, in particular. 18. a substance produced by a living organism that acts as a catalyst to bring about a specific biochemical reaction. 19. Adenosine triphosphate, 20. the strength and vitality required for sustained physical or mental activity.