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Cell Membrane and Transport Retake Assignment

posted Nov 7, 2014, 1:10 PM by Jerrid Johansen
Here is the Answer Key to the Cell Membrane and Transport Retake Assignment.  You can send me an email at if you have questions or concerns.
  1. The water will move into the cell because the solution is hypotonic, and the cell is hypertonic.
  2. The water will also move into the cell for the same reason. There is 55% water outside the cell, and the   cell is 35% water.
  3. The water will move into the cell because there is 55% out and 45% in the cell.  The iodine will do just the opposite.  There is 55% iodine in the cell, and 45% outside of the cell.  All things move from high to low concentrations.
  4. The water will move through osmosis and it will move from outside of the cell to inside of the cell. 
  5. Oxygen, Carbon dioxide, Water
  6. It's two lipid tails with a phosphate head.
  7. The cell membrane regulates the materials that enter and exit the cell
  8. It's fluid because it is flexible and the parts can move around.  It's a mosaic because it is made up of a lot of little pieces working together to make a whole.
  9. The proteins form the channels and pumps that help move large and charge molecules across the cell membrane.  The carb chains act like identification tags for the cell.
  10. Selectively permeable means that only certain materials and molecule can move across the cell membrane
  11. The phosphate head (tennis ball) loves water and is hydrophilic.  The two lipid tails hate water and are hydrophobic.
  12. Passive transport (Osmosis and diffusion) do not require energy and move materials from a high to a low concentration gradient.   This is like cruising down a hill on your bike or floating down a river.  Active transport requires energy and move materials from a low to a high concentration gradient.  This is like pedaling up a hill on your bike, or trying to swim upstream.
  13. Water alone will not get the oil off because the two do not mix together.  The soap molecules help to break up the oil molecules, which will then allow you to get the oil off of your hands.
  14. The sea water is hypertonic, making the plant cells hypotonic.  This causes water to rush out of the plant cells to try and correct the imbalance in salt.  This causes the plants to wilt.
  15. Excess water consumption causes your blood to become hypotonic, making your body cells hypertonic.  This causes water to rush into your cells, forcing them to swell.
  16. Water would flow from the microbe to the jam.  The microbe is hypotonic and the jam is hypertonic.  Water flows from hypo to hyper during osmosis.
  17. Osmosis:  Water moves from hypo to hypertonic solutions.  This does not require energy.  Diffusion:  The solute/sugar molecule moves from hyper to hypotonic solutions.  This too does not require energy.
  18. Hypertonic means the solution has a higher concentration of solute/sugar than another solution.  Hypotonic means the solution has a lower concentration of solute/sugar than another solution.  Isotonic means the two solutions have the same concentration of solute.