Unit 2: Cells - Crossword B

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Across
  1. 7. some molecules can pass through the plasma membrane and some cannot (2 wds.)
  2. 8. this type of gradient is a difference in the amount of molecules across a membrane
  3. 11. these are found in plants, prokaryotes, and fungi and serve as permeability barriers for some substances (2 wds.)
  4. 12. specialized water channels
  5. 13. the shape that two long rows of phospholipids make
Down
  1. 1. this type of transport requires energy
  2. 2. an embedded protein with a carbohydrate attached
  3. 3. a specific polar and uncharged molecule that can move across the membrane in small amounts
  4. 4. this describes the complex structure of the plasma membrane (3 wds.)
  5. 5. molecules can pass freely through the membrane (2 wds.)
  6. 6. large or plentiful molecules being engulfed into the cell
  7. 9. this type of diffusion requires the help of membrane proteins
  8. 10. large or plentiful molecules being released out of the cell
  9. 14. this type of molecule is either positively or negatively charged and requires a protein channel or transport protein to cross the membrane