unit 2

6. (adenosine triphosphate) main energy source that cells use for most of their work
8. Process that does not require oxygen
12. A mixture of gases that surrounds a planet or moon.
13. The process where plants use sunlight, water, and carbon dioxide to produce sugar and release oxygen.
14. An organelle found in plant and algae cells where photosynthesis occurs
16. A chemical substance that is present at the start of a chemical reaction
17. (Adenosine Diphosphate) The compound that remains when a phosphate group is removed from ATP, releasing energy
18. the breakdown of food without the use of oxygen
19. reaction the second stage of photosynthesis that starts with ATP, NADPH, and Carbon dioxide and produces glucose
20. cycle second stage of cellular respiration, in which pyruvic acid is broken down into carbon dioxide in a series of energy-extracting reactions

1. pigment that absorbs light energy in a chloroplast
2. Most abundant gas in the atmosphere
3. An organism that makes its own food
4. reactions The first of two major stages in photosynthesis (preceding the Calvin cycle). These reactions, which occur on the thylakoid membranes of the chloroplast or on membranes of certain prokaryotes, convert solar energy to the chemical energy of ATP and NADPH, releasing oxygen in the process.
5. the solid part of the earth consisting of the crust and outer mantle
7. A substance produced in a chemical reaction
9. Process that requires oxygen
10. All the water at and near the surface of the earth, 97% of which is in oceans
11. respiration Process that releases energy by breaking down glucose and other food molecules in the presence of oxygen
15. Anything that has mass and takes up space