guard cell swells or shrinks due to the gain or loss of water‚ the thickened wall is the only one to maintain its form. Consequently when the guard cells shrink‚ they shift towards each other‚ closing the stomata. Water enters the guard cells by osmosis. The amount and direction of movement of water is influenced by several factors‚ one of which is light. Light has an indirect effect. The guard cells of stomata through which most water loss comes about by transpiration are sensitive to light
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Chapter 4- Sensation and Perception * Sensation vs. Perception * Sensation- Basic processes by which sensory receptors and the nervous system: Receive and represent stimulus energies from environment‚ and entails basic psychological experiences. * Bottom-Up Processing- Sensory detection and encoding; construction of whole from parts. * This includes Lines‚ shapes‚ angels‚ colors‚ items/events that grab our attention * Perception- Interpretation and integration
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Chapter 4 Outline I. Ancient Iran Iran’s mineral resources copper‚ tin‚ iron‚ gold‚ and silver were exploited on a limited scale in antiquity Mountain slopes‚ more heavily wooded. A. Geography and Resources Iran is by the Zagros Mountains to the west‚ the Caucasus Mountains and Caspian Sea to the northwest and north‚ the mountains of Afghanistan and the desert of Baluchistan to the east and southeast‚ and the Persian Gulf to the southwest. Humans trying to survive in these harsh lands had
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Sang Kim Enzyme Catalyst Purpose/Problem: There are four parts to the Enzyme Catalyst lab - Activity A‚ B‚ C‚ and D. In activity A‚ the characteristics of enzyme actions will be observed. The main purposes are to determine the rate of an enzyme catalyzed reaction‚ to study the characteristics of an enzyme mediated reaction‚ and to observe the effect of heat on enzyme activity. The purpose of activity B is to use the Titration Protocol to determine the initial amount of H 2O2 present
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heat for the early Earth? a. meteor bombardment b. gravitational contraction c. radioactivity d. hydrothermal energy 3. What are small asteroids called? a. comets b. meteoroids c. cratons d. microcontinents 4. What is the process by which a planet becomes internally zoned when heavy materials sink toward its center and lighter materials accumulate near its surface? a. photosynthesis b. dewatering c. accretion d. differentiation 5.
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AHP216 04/16/13 I. Introduction: The purpose of this experiment is to observe the osmosis reaction in a potato with salt and water. In cooking cooks will soak their cut potato’s in water if they will not use them immediately. This allows the potato’s to be used later without turning color. The experiment shows the flow of water through the membranes of the potato with salt over a period of four hours. II. Objective: The reaction of the potato to the side submerged in water and the half excavated
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Osmosis is the diffusion of water molecules from an area of high concentration of sucrose solution to an area of lower concentration of sucrose solution‚ through a selectively permeable membrane. The water molecules move down a concentration gradient in osmosis. Two diagrams of osmosis are shown in figures 1 and 2. Figure 1 shows the diffusion of water molecules through a selectively permeable membrane from an area of highly concentrated sucrose solution to an area of lower concentrated sucrose solution
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Osmosis of a Potato cell. Hypothesis is that the potato in saltwater is going to show that it will break down the cells of the potato. Osmosis is the diffusion of a solvent through a semi-permeable membrane‚ from a solution of low solute concentration to a solution with high solute concentration‚ up a solute concentration gradient. Net movement of solvent is from the less-concentrated to the more-concentreated.‚ which tends to redure the difference in concentrations. This effect can be countered
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3.52 Tell whether the following pairs of compounds are identical‚ constitutional isomers or stereoisomers: (a) Cis-1‚ 3-dibromocyclohexane and trans-1‚ 4-dibromocyclohexane (b) 2‚3-dimethylhexane and 2‚5‚5-trimethylpentane (c) Cl Cl Cl Cl and Solution: (a) (b) (c) Constitutional isomers Constitutional isomers Identical a) Solution: Draw two constitutional isomers of cis-1‚2-dibromocyclopentane
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Diffusion‚ Osmosis and Active Transport Substances will move through the membrane by diffusion. This is the random spreading out of particles until they are even. For example‚ when you put your instant coffee in boiling water‚ the coffee particles spread out and fill the entire mug‚ this is diffusion. A second way that substances can move through the cell membrane is by osmosis. This is a special type of diffusion where water moves from a high to a low concentration through a ’partially permeable
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