Biology Review.

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Across
  1. 1. long chains of amino acid molecules.
  2. 5. a series of chemical reactions that convert light, energy, water, and CO2 into food-energy molecule glucose and give off oxygen.
  3. 7. are macromolecules that form when long chains of molecules called nucleotides.
  4. 8. the diffusion of water molecules only through a membrene.
  5. 9. one sugar molecule two sugar molecules or a long chain of sugar molecules a make up of...
  6. 11. membrane-bound organelles that use light energy and make food. (photosynthesis).
  7. 12. a series of chemical reactions that convert the energy in food molecules into a usable form of energy called ATP.
  8. 13. other structures with specialized functions.
  9. 15. a stiff structure outside the cell membrane.
  10. 18. a process by which glucose, a sugar, is broken into smaller molecules.
  11. 19. the movement of substances through a cell membrane only by using the cell's energy.
  12. 22. states that all living things are made of one or more cells, the cell is the smallest unit of life and all cells come from preexisting cells.
  13. 23. the movement of substances from an area of highr concentration to an area of lower concentration.
Down
  1. 2. the process during which a cell's vesicles release their contents outside the cell.
  2. 3. a fluid inside a cell that contains salts and other molecules.
  3. 4. the movement of substances through a cell membrane without using the cell's energy.
  4. 6. is a reaction that eukaryotic and prokaryotic cells can use to obtain energy from food when oxygen levels are low.
  5. 10. when molecules pass through a cell membrane using special proteins called transport proteins.
  6. 12. a flexible covering that protects the inside of a cell from the enviroment outside a cell.
  7. 14. forms by joining many smalls molecules together.
  8. 16. the process during which a cell takes in a substance by surrounding it with the cell membrane.
  9. 17. large macromolecule that does not dissolve in water.
  10. 20. is a network of threadlike proteins that are joined together.
  11. 21. the part of a cell that directs cell activities and contains genetic information stored in DNA, DNA is organized into structures called chromosomes.