Bio CK12 2.21 Photosynthesis

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Across
  1. 4. exchange of oxygen and carbon dioxide between the body and the outside air
  2. 5. an electrochemical gradient across the thylakoid membrane and the inner membrane of the mitochondrion; due to concentration differences of both positive charges and hydrogen ions
  3. 10. common name of a plant-like protist, which contains chloroplasts and makes food by photosynthesis
  4. 12. an atom or group of bonded atoms that has a positive or negative charge
  5. 13. membrane-spanning protein that allows transport of a specific ion through the cell membrane
  6. 15. multicellular, heterotrophic eukaryote with specialized cells that lack cell walls; member of the animal kingdom
  7. 16. an individual living thing
  8. 20. organelle in the cells of plants and algae, that contains chlorophyll and is the site of photosynthesis
  9. 21. first stage of photosynthesis in which light energy from the sun is captured and changed into chemical energy that is stored in ATP and NADPH
  10. 22. the difference in the concentrations of molecules across a membrane
  11. 23. green pigment in a chloroplast that absorbs light energy during the light reactions of photosynthesis
  12. 25. an ion channel and enzyme that uses the energy of hydrogen ions to chemically bond a phosphate group to ADP, producing ATP
  13. 27. sharing of electrons between two atoms that holds the atoms together
  14. 28. basic unit of structure and function of living things
Down
  1. 1. series of electron-transport molecules that pass high-energy electrons from molecule to molecule and capture their energy
  2. 2. difference across a membrane due to both a chemical force and an electrical force; drives the movement of ions across the membrane
  3. 3. third stage of cellular respiration, which occurs on the inner membrane of mitochondria, requires oxygen, and produces up to 34 molecules of ATP
  4. 6. a protein molecule that is attached to, or associated with, the membrane of a cell or an organelle
  5. 7. short-term energy carrier; temporarily stores energy during photosynthesis
  6. 8. a group of organisms that can mate with one another to produce fertile offspring
  7. 9. a protein that acts as a biological catalyst, increasing the rate of a biochemical reaction
  8. 11. movement of substances across a plasma membrane that requires energy because the substance is moving against the concentration gradient, from a lower to higher concentration
  9. 14. molecules that accept and temporarily hold high-energy electrons
  10. 17. mixture of gases that surrounds a planet such as Earth
  11. 18. splitting water by light; produces the hydrogen ions and electrons used in light reactions and oxygen atoms
  12. 19. the ability to do work
  13. 24. energy-carrying molecule that cells use to power their metabolic processes; provides the cell with an immediate usable form of energy
  14. 26. flattened sac of membrane inside a chloroplast where the first stage of photosynthesis (light reactions) occurs