B2.1

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Across
  1. 4. A small membrane-bound sac used to transport materials within a cell.
  2. 6. The movement of substances against a concentration gradient using ATP.
  3. 10. The water-attracting phosphate head of a phospholipid.
  4. 13. A molecule that possesses both hydrophilic and hydrophobic regions.
  5. 14. The process of releasing materials from a cell via vesicle fusion.
  6. 16. The type of diffusion that requires channel or carrier proteins.
  7. 18. Proteins that are permanently embedded within the plasma membrane.
Down
  1. 1. Proteins that are temporarily attached to the surface of the membrane.
  2. 2. A protein with an attached carbohydrate chain used for cell recognition.
  3. 3. The primary lipid molecule that forms the bilayer of biological membranes.
  4. 5. The process of taking materials into the cell by infolding the membrane.
  5. 7. The water-repelling fatty acid tails of a phospholipid.
  6. 8. A steroid that regulates membrane fluidity in animal cells.
  7. 9. The double-layered arrangement of lipids that forms a cell membrane.
  8. 11. A type of protein (like Sodium-Potassium) used for active transport.
  9. 12. The passive movement of water molecules across a semi-permeable membrane.
  10. 15. The passive movement of small or non-polar particles across the bilayer.
  11. 16. The model describing the membrane as a dynamic, flexible structure.
  12. 17. The term describing a membrane that only allows certain substances to pass.