AP Biology Unit 2 Cell Structure and Function Crossword

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Across
  1. 6. describes a solution whose solute concentration is equal to the solute concentration inside a cell (causes no net change of water into or out of the cell)
  2. 7. a single-celled organism that does not have a nucleus or membrane-bound organelles; examples are archaea and bacteria
  3. 9. envelope layer of two membranes that surrounds the nucleus of a cell
  4. 11. the diffusion of water across a selectively permeable membrane (from high to low)
  5. 15. describes a solution whose solute concentration is higher than the solute concentration inside a cell (causes the cell to shrink/shrivel)
  6. 17. diffusion movement of specific molecoles across cell membranes through protien channels with no energy expenditure
  7. 18. matrix the compartment of the mitochondrion enclosed by the inner membrane and containing enzymes and substrates for the citric acid cycle as well as ribosomes and DNA
Down
  1. 1. protein transmembrane protein that helps a certain substance or class of closely related substances to cross the cell membrane.
  2. 2. the movement of materials through a cell membrane using energy
  3. 3. Mosaic Model model of cell membrane structure, which envisions the membrane as a mosaic of protein molecules drifting laterally in a fluid bilayer of phospholipids.
  4. 4. regulation of solute concentrations and water balance by a cell or organism
  5. 5. process by which a cell takes in a substance by surrounding it with the cell membrane
  6. 8. transport the diffusion of substances across a cell membrane without the use of energy
  7. 10. membrane-bound sac containing hydrolytic enzymes that can break down proteins, nucleic acids, and polysaccharides (suicide sacs)
  8. 12. the process by which a substance is released from the cell through a vesicle that transports the substance to the cell surface and then fuses with the membrane to let the substance out
  9. 13. the random movement of a substance down its concentration gradient from a more concentrated to a less concentrated area.
  10. 14. a cell that contains a nucleus and membrane bound organelles
  11. 15. describes a solution whose solute concentration is lower than the solute concentration inside a cell (cell gains water)
  12. 16. Membrane thin flexible barrier that regulates what enters and exits the cell; composed of two layers of lipids (bilayer)