the sugar molecules. Indicate which side is initially hypertonic and which is hypotonic. Show‚ using an arrow‚ the direction of osmosis. 4. Red blood cells are placed in three beakers containing the following solutions: Beaker distilled water‚ Beaker B – isotonic solution‚ Beaker C – 5% salt solution. Describe the
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PLASMA MEMBRANE SELECTIVE PERMEABILITY= allowing some substance to cross it more easily than others composed of: Phospholipids Proteins Carbohydrates Cholesterol FLUID MOSAIC MODEL Phospholipids are primary lipids(constantly moving‚ fluidly) AMPHIPATHIC-containing hydrophobic and hydrophilic regions Mosaic part=not made of one thing Freeze-fracture studies:way to view what’s inside FLUIDITY OF MEMBRANE Move within bilayer Most of lipids and some proteins‚ drift laterally
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water by osmosis. Paramecium Use contractile vacuoles to actively pump water out of the cells. Humans Surround the cells with an isotonic extracellular fluid. If 2 solutions have unequal concentrations of solutes‚ the solution with the higher solute concentration is called hypertonic and the solution with the lower solute concentration is called hypotonic. Which of the following are true of the plasma membrane? It is fluid. It is selectively permeable. Triglycerides and phospholipids
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solutes that make a solution isotonic. If the iodine concentration is higher outside the dialysis bag of starch and glucose than in it‚ iodine along with water will diffuse into the bag while the starch remains in the dialysis bag and some glucose will diffuse out of the dialysis bag. Solution | Solute Concentration (M) | Tonicity (i.e. hypotonic) | Expected mass change (+ or -) | 1 | 0.058 M | Hypertonic | - | 2 | 0.134 M | Hypertonic | - | 3 | .000385 M | Hypotonic | +
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diffusion and osmosis? 5. Define osmosis‚ hypertonic‚ hypotonic‚ isotonic solutions 6. What happens if you have a high concentration of salt water on the outside of the egg‚ yet there is very little salt inside the egg? What direction will the water move? Is this solution hypertonic‚ hypotonic‚ or isotonic? 7. What happens if you place another egg into a bowl of pure water? What direction will the water move? Is this solution hypertonic‚ hypotonic‚ or isotonic? 8. What cell part controls what enters
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molecules kinetic energy until equilibrium is reached. The random movement of the molecules continues even at the equilibrium. Osmosis: Is the diffusion of water across a membrane. Hypertonic: Water diffuses out of the cell‚ causing it shrink. Hypotonic: Water diffuses into the cell‚ causing it to swell. Isotonic: Water diffuses into and out of the cell at equal rate‚ causing the cell to stay the same size. 4 Egg #1 Egg in the vinegar solution Problem: What will
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across a partially permeable membrane. They move from a region of low concentration (hypotonic) to a region of high concentration (hypertonic). The rate of osmosis across a eukaryotic cell membrane can be affected by different factors; including temperature‚ concentration gradient‚ water potential and the surface area for osmosis to occur and pressure exerted on either side of the semi-permeable membrane. A potato (Solanum Tuberosum) contains 92% water‚ which is an osmotically active component. The
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molecules diffuse across the cell membrane from an area of higher solute concentration to an area of lower solute concentration. There are three relative concentrations of solutions. Hypertonic solutions yield a higher concentration than that of the cell.Hypotonic solutions have a lower concentration and isotonic solution has an equal concentration. Method: The eggs were soaked in vinegar for 48 hours. At the end of this period the eggs are dried off and mass is recorded. The eggs are then placed
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in the vinegar to the lower concentration in the egg‚ which causes the egg to increase in size. A hypotonic solution is when the solution has a lower concentration of solute (higher concentration of water) than inside the cell. This is correspondent with this lab because the vinegar has a higher concentration of water than the egg. This clarifies why the egg increases in size. In contrast‚ a hypertonic solution occurs when the solution has a higher percentage of solute (lower concentration of water)
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Overview: Life at the Edge The plasma membrane separates the living cell from its nonliving surroundings. This thin barrier‚ 8 nm thick‚ controls traffic into and out of the cell. Like all biological membranes‚ the plasma membrane is selectively permeable‚ allowing some substances to cross more easily than others. Concept 7.1 Cellular membranes are fluid mosaics of lipids and proteins The main macromolecules in membranes are lipids and proteins‚ but carbohydrates are also important. The
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