science crossword puzzle

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Across
  1. 2. Respiration The process where glucose (chemical energy) is broken down to release energy (ATP). It requires oxygen and glucose.
  2. 4. A substance produced as the result of a chemical reaction.
  3. 5. complex molecules are broken down into simpler ones
  4. 7. A molecule that an enzyme reacts with.
  5. 8. A biological catalyst
  6. 12. A "self-feeder" - an organism that can make its own food (glucose) from simpler substances
  7. 13. A substance that alters the rate of a chemical reaction, but remains unchanged at the end
  8. 14. The process by which green plants convert light energy (solar) from the sun into useable chemical energy stored in organic matter. It requires carbon dioxide, water, chlorophyll and light.
Down
  1. 1. Combined system of all the chemical reactions in cells.
  2. 3. An organism that feeds on other organisms to obtain its food.
  3. 4. A long chain of amino acids joined together, forming a specific shape
  4. 6. Energy The minimum energy required to cause a process (such as a chemical reaction) to occur
  5. 9. A group of atoms joined together.
  6. 10. Site Region of an enzyme where the substrate binds.
  7. 11. When complex molecules are built up from smaller ones.