You are a scientist modifying cells to have optimum efficiency of exchange across the plasma membrane. Would it be beneficial to just greatly increase the cell size and therefore increase the amount of membrane? Why/why not?
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- CELL ENVIRONMENTS Fill in the following statement: Diffusion is the movement of molecules from_high_concentration to_low. concentration. is the diffusion of water. BEAKER #I The solution inside the beaker is: % water % salt The solution inside the cell is: 90 10 % water % salt 20% salt How will the water move? Into the cell or out of the cell? 10% salt How will the movement of water affect the cell? The cell O Water molecules This is a(n) solution.Fill in the blanks with the following words: diffusion, endocytosis, solute pump, osmosis. The type of active transport in which sodium and potassium are pumped across a membrane using ATP is called a This passive process is where water moves in and out of a cell The type of passive process in which molecules move across the plasma membrane down a concentration gradient is called This process is where the cell engulfs extracellular substances by phagocytosis or pinocytosisCrossing a cell membrane by simple diffusion can be distinguished from facilitated diffusion by which of the following: Select all that apply. Simple diffusion moves molecules down a concentration gradient while facilitated diffusion moves molecules up a concentration gradient Simple diffusion does not require membrane proteins; facilitated diffusion requires specific membrane proteins Simple diffusion does not require energy; facilitated diffusion requires energy Simple diffusion is not saturable; facilitated diffusion rates are limited by the number of functional membrane proteins and can be saturated
- Would it be possible for small ions to passively diffuse (simple diffusion) across a selectively permeable membrane? Why? A Yes, because ions are highly non-polar in nature B Yes, because ions are highly polar in nature No, because it needs the aid of transport proteins to cross the membrane No, because not only transport proteins but also metabolic energy from ATP are needed to transport ions across the plasma membraneWhat is unique about plasma membrane? Why is it advantageous for the plasma membrane to be fluid in nature? How does the sodium-potassium pump contribute to the net negative charge of the interior of the cell? In medicine, why is it important to administer only isotonic intravenous solutions to patients? Example of isotonic IV fluids are normal saline and lactated Ringer’s solution. Potassium is a necessary nutrient in order to maintain the function of our cells. What would occur to a person that is deficient in potassium?Which of the following statements about diffusion is correct? It is an active process in which molecules move from a region of lower concentration to one of higher concentration. It is very rapid over long distances. It requires an expenditure of energy by the cell. It is a passive process in which molecules move from a region of lower concentration to a region of higher concentration. It is a passive process in which molecules move from a region of higher concentration to a region of lower concentration.
- The cytoplasm of a certain cell is composed of a solution that is 98% water, 2% solutes. Consider the solution shown in the beaker in this picture: FOOE OOS Foor solution. [Select] Cytoplasm is 98% water, 2% solutes. The solution in the beaker would be considered when compared to [Select] The plasma membrane is impermeable to solutes. Beaker solution is 98% water, 2% solutes the cell. We would expect that the cell would [Select] if it was placed in the would account for whatever changes might occur to the volume of the cytoplasm of the cell when it is placed in the solution.The primary function of the kidney is to exchange molecules across a membrane between the blood and the urine. One type of kidney cell has a basic rectangular shape, except for a single surface, which is lined with tiny, finger-like projections that extend into the surrounding extracellular space. Which of the following best explains the advantage these projections provide the cell? The projections increase the selectivity of the membrane because the small size of the projections limits the number of transport proteins that can be embedded in the membrane. The projections increase the volume of the cell without affecting the surface area, which increases the metabolic needs of the cell. The projections increase the surface area–to-volume ratio of the cell, which allows for more efficient nutrient exchange with the environment. The projections increase the speed at which an individual molecule can move,…Compare and contrast the four basically different ways that a substance can move across the plasma membrane. Present it in a matrix.
- Which of the following is related with getting the sodium ions inside the cell membrane 1_primary active transport2_secondary active3_simple diffusion4_facilitatedRebuild the cell above that is hypertonic to the solution outside. By hitting the red button, add 20 solutes (green) to the inside of the cell and add 5 water (blue) to the inside of the cell. Also, add 20 water (blue) to the outside of the cell and 5 solutes (green) to the outside of the cell. Add blue gated channels to the membrane. Q: What happens to the water molecules in this situation? Q: Which of the above situations is closer to a living membrane system?Students set up an experiment in which they filled dialysis tubing with a 3% starch solution. They tied off the ends of the tubing and placed it in a beaker filled with distilled water and 1% iodine for 3 hours as shown in the diagram. 3% starch solution 1% lodine solution Since dialysis tubing is semi-permeable like the plasma membrane, the bag of white starch solution was bluish- black the next day. What is the best explanation for the results? (1D) O The starch solution diffused into the beaker because the concentration of water is greater in the starch solution than in the iodine solution. The iodine solution diffused into the bag because the concentration of water is greater in the starch solution than in the iodine solution. O The lodine solution diffused into the bag because the concentration of water is greater in the iodine solution than in the starch solution. O The starch solution diffused into the beaker because the concentration of water is greater in the iodine solution…