Cell Structure & Function

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Across
  1. 3. All living organisms are composed of one or more cells. The cell is the basic unit of structure and organization in organisms. Cells arise from pre-existing cells.
  2. 5. a membrane-bound cell organelle that contains digestive enzymes.
  3. 6. he barrier that keeps ions, proteins and other molecules where they are needed and prevents them from diffusing into areas where they should not be.
  4. 9. the semipermeable membrane surrounding the cytoplasm of a cell.
  5. 12. a space or vesicle within the cytoplasm of a cell, enclosed by a membrane and typically containing fluid.
  6. 13. allowing liquids or gases to pass through it.
  7. 14. a complex of vesicles and folded membranes within the cytoplasm of most eukaryotic cells, involved in secretion and intracellular transport.
  8. 15. a network of membranous tubules within the cytoplasm of a eukaryotic cell, continuous with the nuclear membrane. It usually has ribosomes attached and is involved in protein and lipid synthesis.
  9. 18. organisms whose cells contain a nucleus and other membrane-bound organelles
  10. 19. (in green plant cells) a plastid that contains chlorophyll and in which photosynthesis takes place.
  11. 20. smallest unit of a living organism
Down
  1. 1. a microscopic network of protein filaments and tubules in the cytoplasm of many living cells, giving them shape and coherence.
  2. 2. the semipermeable membrane surrounding the cytoplasm of a cell.
  3. 4. a microscopic single-celled organism that has neither a distinct nucleus with a membrane nor other specialized organelles.
  4. 7. allowing certain substances to pass through it but not others, especially allowing the passage of a solvent but not of certain solutes.
  5. 8. any of a number of organized or specialized structures within a living cell.
  6. 10. a minute particle consisting of RNA and associated proteins found in large numbers in the cytoplasm of living cells.
  7. 11. the membrane-enclosed organelle within a cell that contains the chromosomes.
  8. 16. a rigid layer of polysaccharides lying outside the plasma membrane of the cells of plants, fungi, and bacteria. In the algae and higher plants it consists mainly of cellulose.
  9. 17. an organelle found in large numbers in most cells, in which the biochemical processes of respiration and energy production occur. It has a double membrane, the inner layer being folded inward to form layers (cristae).
  10. 19. the gelatinous liquid that fills the inside of a cell