A cell with intracellular osmolarity of 280 mOsm/L is placed into three different containers varying in osmolarity. Which solution from the list would cause the cell to lose water and shrink? 280 mOsm/L 240 mOsm/L 340 mOsm/L NONE of the above
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- Blood is taken from a snake with a plasma osmolarity of 300 mOsM. The cells are purified and resuspended in a saline solution that approximates the snake's blood. Which is the best solution to use? 150 mM KCI 150 mM NaCl 300 mM KCI 300 mM NaClA cell with a total of 0.3 osmol/L is placed into a solution with a total of 0.2 osmol/L. It is assumed that the osmotic particles cannot pass through the cell membrane. Answer the following true or false questions. 1. All particles will diffuse down a concentration gradient, that is, move from a high concentration into a lower concentration 2. Diffusion down a gradient happens because particles are constantly moving (Kinetic Theory) 3. When solvent particles move down a gradient through a membrane it is called osmosisIn an investigation of osmosis, apple cores were submerged in different molarity solutions to determine the unknown osmolarity of the apple. To determine the molarity five uniform apple cores were massed before submerging them in different molarity solutions. After 24 hours the apple cores were massed again. Then the percent change in mass was determined for the five uniform apple cores in each molarity solution. (b) Identify the osmolarity of the apple.
- Draw a beaker that is filled with water. Label the water with an osmolarity of 0.61M. In the water, draw a single Elodea cell (note: Elodea is an aquatic plant) with a cellular osmolarity of 0.42M. Name this drawing with the tonicity term that best describes the solution of the water in the beaker compared to the osmolarity of the Elodea cell. Then describe what will happen to the tonicity of the cell over time. Make sure to explain the direction that water will flow, small molecules will diffuse, and explain what will happen to this cell over time. Make sure you use all of the applicable tonicity terms in your description.What effect might a change in extracellular osmolarity have on the movement of water across cell membranes (you can assume that plasma and interstitial fluid osmolarities are the same)?Calculate the osmolarity of a 3% NaCl solution. Is this solution hypotonic OR hypertonic?
- If a person was severely dehydrated and the osmolarity of their blood and tissue fluids was at 500 mOsm/L while their intracellular osmolarity was 300 mOsm/L; explain what would happen via osmosis.An aqueous solution has an osmolarity of 318 mOsm. If a cell with an intracellular osmolarity of 260 mOsm is placed into this solution, the solution is said to be hypertonic isotonic isoosmotic hypotonicA cell with a total of 0.3 osmol/L is placed into a solution with a total of 0.2 osmol/L. It is assumed that the osmotic particles cannot pass through the cell membrane. Answer the following true or false questions. 1. Osmosis of water molecules will go into the cell 2. The cell will swell and possibly lyse 3. Plant cells are NOT protected against lysis by their cell walls
- The osmolarity at the bottom of the loop of Henle is O 100mOsm O 300mOsm 900mOsm O 1200mOsm O 1500mOsmA cell with a total of 0.2 osmol/L is placed into a solution with a total of 0.3 osmol/L (switched from the previous question). It is assumed that the osmotic particles cannot pass through the cell membrane. Answer the following true or false questions. 1. Solvent is more concentrated in the cell 2. Water will osmose out of the cell 3. The cell will shrink and may look crenated 4. Plant cells have a cell wall to protect them from dehydration caused by osmosisThe osmolarity of physiological saline solution is 0.30 osmol/L. Assuming that the cell membrane is not permeable to its ions, is a 0.110 M aqueous solution of magnesium sulfate, MgS04, hypertonic, hypotonic or isotonic to red blood cells? If normal red blood cells were suspended in this MgSO4 solution, what would be the expected outcome? |