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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Name:_______________________ Date:___________ Period:______ Page:_______ Potato Diffusion Lab Hypothesis:________________________________________________________________________ __________________________________________________________________________________ Materials Aprons/Goggles Potato Slice (2-3cm thick) Potato Borer Triple beam balance 6 x 100mL beakers plastic wrap Paper towel 50mL Distilled Water 50mL 0.2M Sucrose solution 50mL 0.4M Sucrose solution 50mL 0.6M Sucrose
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regulate what goes in and out of a cell. It also allows cells to control their internal chemical environment and the availability of important materials. In a hypertonic solution‚ there is a greater concentration of solute inside a cell compared to another solution (water will flow from out of the potato cells and the mass will decrease). In a hypotonic solution‚ there is a lower concentration of solute compared to another solution (water will flow into the potato cells and the mass will increase). In
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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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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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“Cells are the basic building blocks of all living things” (Genetics Home Reference‚ 2015)‚ cells are the smallest unit that is capable of performing life functions. They are responsible for the conversion of nutrients from food into energy‚ the structure of the body and perform specialised functions for each different organelle. There are two main types of cells‚ Prokaryotic and Eukaryotic. The Prokaryotic (see appendix one) is a single-celled organism without a membrane-bound structure‚ meaning
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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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