AP BIOLOGY CELL UNIT ACTIVITY #5 NAME_____________________ DATE___________HOUR_____ CELL TRANSPORT MEMBRANE PROPERTIES PASSIVE TRANSPORT CHARACTERISTICS: DIFFUSION: Cell Unit Activity #5 page 1 OSMOSIS : ISOTONIC ANIMAL CELLS Cell Unit Activity #5 page 2 HYPOTONIC HYPERTONIC PLANT CELLS OSMOREGULATION – ADAPTATIONS Paramecium Fresh Water Bony Fish FACILITATED D IFFUSION: Cell Unit Activity #5 page 3 Marine Bony Fish ACTIVE TRANSPORT CHARACTERISTICS:
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Simple Diffusion Activity 1: Simulating Simple diffusion 1.What is the molecular weight of Na+? 22.9 2. What is the molecular weight of Cl-? 35.45 3. Which MWCO dialysis membranes allowed both of these ions through? 50‚ 100‚ and 200 4. Which materials diffused from the left beaker to the right beaker? Urea‚ NaCl and glucose diffused 5. Which did not? Why? Albumin‚ because the molecular weight exceeded the highest MWCO membrane‚ thus being to large to pass through
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Diffusion and Osmosis Diffusion The exchange of substances between cells and the environment occur in ways that require metabolic energy (active transport) and in ways that do not (passive transport-Energy from natural‚ inbuilt motion of particles). Diffusion is an example of passive transport. Diffusion is the net movement of molecules or ions from a region where they are more highly concentrated to one where their concentration is lower. Figure 1 Figure 2 Diffusion is only
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you be able to observe any diffusion?NO there is no diffusion taking place. 12. Does being unable to observe diffusion necessarily mean that diffusion is not taking place? yes you should be able to tell when equilibrium is reached Osmosis Activity 4: Osmosis 13. Did you observe any pressure changes during the experiment? If so‚ in which beaker(s)‚ and with which membranes? Yes in the left beaker at the membrane 20. 14. Why? 15. Did the Na+/Cl- diffuse from the left beaker to the right
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OSMOSIS Aim To determine the water potential of potato tuber cells. Background knowledge Osmosis is defined as the movement of water molecules from a region of higher water potential to a region of lower water potential through a partially permeable membrane. Osmosis is considered in terms of water potential and solute potential. Water potential is a measure of the kinetic energy of water molecules. Here‚ water molecules are constantly moving in a random fashion. Some of them collides with cell
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the water and sucrose‚ osmosis can no longer take place. Osmosis can only occur when water is traveling from a higher concentrated area to a lower concentrated area. Hydrostatic pressure occurs when the bag reaches maximum capacity. Water will enter the bag through osmosis but get pushed out through hydrostatic pressure. This works in a cycle and prevents the bag from obtaining more volume and mass. 1b. The curves for the 40% and 20% sucrose differ in the rate of osmosis because of their concentration
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-12:15 PM Room 113 MRB (CRN 10304)--Cole Lecture Section 001: Tuesday/Thursday 1:00-2:15 PM Room G24 EIE (CRN 10305)--Cole Lab Section 002: Wednesday 10:30 – 11:20 AM Room 421 ARM (CRN 14335)— Cole Lab Section 003: Wednesday 11:30 AM – 12:20 PM Room 421 ARM (CRN 14336)— Cole Lab Section 004: Wednesday 12:30 – 1:20 PM Room 421 ARM (CRN 14337)— Cole Lab Section 005: Wednesday 1:30 – 2:20 PM Room 421 ARM (CRN 14338)—Cole Important Things You Should Know About This Course: 1
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The Semipermeability of Cell Membrane to Different Osmotic Environments Using Dialyzing Bag Model1 Sittie Johaynnah M. Sambarani Group 3 Sec. I-1L December 17‚ 2012 ------------------------------------------------- ------------------------------------------------- ------------------------------------------------- ------------------------------------------------- 1 A scientific paper in partial fulfillment of the requirements in Biology 10 Laboratory under Professor Junaldo
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balance and internal salt for several different reasons such as‚ compensating for water loss‚ avoiding excess water gain‚ and maintaining a proper osmotic concentration of the body fluids (Saladin‚ 2010). This process is derived from osmosis‚ however is much more complex. Osmosis is the diffusion of water down its cavity gradient through a semipermeable membrane. The aim of the experiment was to determine whether P. lurca (Phylum Sipuncula) was an osmoconformer and U. coarctata‚ a fiddler crab (Phylum
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classified as a means of passive transport. In simple diffusion‚ a hydrophobic molecule can move into the hydrophobic region of the membrane without getting rejected. Simple diffusion does not involve a protein. An example of simple diffusion is osmosis. Hydrophilic molecules cannot participate in simple diffusion because they would move into the hydrophobic region of the membrane and be rejected. Facilitated diffusion is a type of passive transport that is dependent on single transport protein
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