#2 Elodea and Photosynthesis by __________________ Name:_____________________ Class:_____________________ Teacher:_____________________ Date:_____________________ Elodea and Photosynthesis Introduction: Photosynthetic organisms (cyanobacteria) first evolved about 3.5 billion years ago and are the oldest know fossils on Earth. Cyanobacteria live in water‚ can manufacture their own food‚ and are one of the most important groups of bacteria on Earth. The Cyanobacteria have been important
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Osmosis is the spontaneous net movement of solvent molecules through a partially permeable membrane into a region of higher solute concentration‚ in the direction that tends to equalize the solute concentrations on the two sides. It may also be used to describe a physical process in which any solvent moves‚ without input of energy‚ across a semipermeable membrane separating two solutions of different concentrations. Although osmosis does not require input of energy‚ it does use kinetic energy and
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Osmosis Osmosis is a special example of diffusion. It is the diffusion of water through a partially permeable membrane from a more dilute solution to a more concentrated solution – down the water potential gradient) Note: diffusion and osmosis are both passive‚ i.e. energy from ATP is not used. A partially permeable membrane is a barrier that permits the passage of some substances but not others; it allows the passage of the solvent molecules but not some of the larger solute molecules. Cell
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Investigation: A factor that affects the movement of water in and out of cells. Osmosis: movement of water from a region of high water potential to a region of low water potential through a partially permeable membrane. High water potential = lots of free water molecules‚ low solute concentration Low water potential = very few free water molecules‚ high solute concentration Factors That Affect the Movement of Water in and out of Cells * Solute concentration * If one solution
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Osmosis: How fast can you move? The Rate at which Osmosis Occurs when Exposed to Various Toxicities Within the human body many things are occurring at all times. Without these small‚ seemingly insignificant processes all human life would cease to exist. One of the aforementioned activities is Osmosis‚ or the movement of water across a selectively permeable membrane eventually establishing equilibrium on both sides of the concentration gradient (Freeman 90). During this specific experiment involving
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allows certain molecules or ions to get in or to get out of the cell. There are three types of movement of particals across the cell: diffusion(and also facilitated diffusion)‚ osmosis and active transport. Diffusion and osmosis are passive movements and they don’t require any energy. Active transport requires ATP energy. OSMOSIS is the passive movement of water molecules across a partially permeable (semipermeable) membrane‚ from a region of lower solute concentration to a region of higher solute concentration
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Advanced Placement Biology ® AP Biology Lab 1 281 EDVO-Kit # Storage: Principles & Practice of Diffusion & Osmosis Store entire experiment at room temperature. EXPERIMENT OBJECTIVE The objective of this experiment is to develop an understanding of the molecular basis of diffusion and osmosis and its physiological importance. Students will analyze how solute size and concentration affect diffusion across semi-permeable membranes and how these processes affect water potential. Students
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Osmosis Aim: To determine the concentration of cell sap in a potato cell. Osmosis is the movement of water through a semi-permeable membrane. It starts from a weak solution and becomes a more stronger solution until the concentrations on both sides are equal. To investigate the range of solutions needed to find the point at which the surrounding solution is the same as the cell sap in the vacuole.
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increased in mass as well. Bags 1 and 2 increased in mass while bag 3 stayed the same. Bag 4 resulted in a decrease in mass. The results I got from this experiment do support what I predicted before the trials. Above you can see a specimen of an Elodea leaf with a drop of aquarium water. I have labeled the cell wall‚ cell membrane‚ cytoplasm‚ and the chloroplast. If you look closely the cell membrane and the cytoplasm are really close to the cell wall. The cell wall is outer layer maintaining the
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1.22 0.86‚ 0.86‚ 1.98 1.23 0.82 2 1.11‚ 1.10‚ 1.26 1.16 0.87‚0.96‚ 0.85 0.89 -23 4 1.26‚ 1.27‚ 1.22 1.25 0.98‚ 1.01‚ 0.98 0.99 -20.8 6 1.50‚ 1.44‚ 1.31 1.42 1.43‚ 1.23‚ 1.36 1.34 -5.63 8 1.41‚ 1.17‚ 1.26 1.28 1.08‚ 1.21‚ 0.97 1.09 -14.84 10 1.29‚ 1.17‚ 1.18 1.21 0.94‚ 1.01‚ 0.96 0.97 -19.83 Table to show the 2nd experiment Sucrose Concentration (%) Mass before
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