Cells in Action

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Across
  1. 3. respiration the process by which cells use oxygen to produce energy from food.
  2. 5. a living thing; anything that can carry out life processes independently
  3. 7. the breakdown of food without the use of oxygen.
  4. 9. cell organelle composed of RNA and protein; the site of pro- tein synthesisendoplasmic reticulum a sys- tem of membranes that is found in a cell’s cytoplasm and that assists in the production, processing, and transport of proteins and in the production of lipids
  5. 12. in eukaryotic cells, the cell organelle that is surrounded by two membranes and that is the site of cellular respiration
  6. 16. a phospholipid layer that covers a cell’s surface; acts as a barrier between the inside of a cell and the cell’s environment
  7. 17. the process by which plants, algae, and some bacteria use sunlight, carbon dioxide, and water to make food.
  8. 19. are structures that perform specific functions within the cell.
  9. 23. the movement of substances across a cell mem- brane without the use of energy by the cell
  10. 25. an organism made up of cells that have a nucleus enclosed by a membrane; eukaryotes include animals, plants, and fungi, but not archaea or bacteria.
  11. 26. a cell organelle that con- tains digestive enzymes
  12. 27. a group of similar cells that perform a common function
Down
  1. 1. is the smallest unit that can perform all the processes necessary for life
  2. 2. a group of organs that work together to perform body functions
  3. 4. the process by which a cell membrane surrounds a particle and encloses the particle in a vesicle to bring the particle into the cell.
  4. 6. is the arrangement of parts in an organism.
  5. 8. a sys- tem of membranes that is found in a cell’s cytoplasm and that assists in the production, processing, and transport of proteins and in the production of lipids
  6. 10. a collection of tissues that carry out a specialized function of the body
  7. 11. in a eukaryotic cell, a membrane-bound organelle that contains the cell’s DNA and that has a role in processes such as growth, metabolism, and reproduction
  8. 13. the movement of par- ticles from regions of higher density to regions of lower density
  9. 14. a rigid structure that surrounds the cell membrane and provides support to the cell
  10. 15. the movement of substances across the cell membrane that requires the cell to use energy
  11. 18. is the job the part does. For example, the structure of the lungs is a large, spongy sac.
  12. 20. a small cavity or sac that contains materials in a eukaryotic cell.
  13. 21. are single-celled organisms that do not have a nucleus or membrane-bound organelles.
  14. 22. cell organelle that helps make and package materials to be transported out of the cell
  15. 24. the diffusion of water through a semipermeable membrane