Mrs. Riley AP Biology Osmosis and Diffusion Lab I. Introduction: Diffusion is vital to many life functions of a cell‚ it allow the transportation of vitally important nutrients and compounds without the expenditure of excess metabolic energy. To explain diffusion‚ it is as if a bottle of perfume is opened at one end of the room‚ then in a short amount of time a person at the other end of the room can detect the scent of the perfume; this is the process of diffusion. Diffusion is a movement
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Plant Pigments and Photosynthesis Problem: We are going to separate and identify pigments and other molecules from cell extracts through a process called chromatography. We will also test the theory that light and chloroplasts are required for light reactions to occur. Background: Pigments are chemical compounds which reflect only certain wavelengths of visible light. This is what makes them seem colorful. Many things contain pigments including flowers‚ corals‚ and even skin. More important than
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Abstract This investigation was undertaken in order to observe the effects of changing the temperature of the solution that a potato cube is placed in. The temperatures that were tested in this investigation were 0°C‚ 20°C (room temperature)‚ and 70°C. This investigation tested the hypothesis: The rate of osmosis will increase as the temperature increases 2x2x2cm cubes of potato were weighed and then placed into 100mL of 10% NaCl solutions for 10 minutes. After 10 minutes the cubes were again
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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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her meticulously. 3.Invasive cervical carcinomas‚ which have penetrated the surface of the cervix‚ was rare back that time‚ so the doctor did not worry about it‚ so he treated it aggressively. He removed her organs. The doctor did biopsy her cell. 4. He is the doctor who was working at Hopkins‚ and he was growing cells outside of human bodies. He wanted to grow immortal cells that do not die quickly outside of human bodies while the cells‚ that he was growing‚ die quickly. 5. The consent
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impulses‚ around the body. Nervous tissues support the information-processing functions of neurons in various ways. D) Muscle Tissues account for most of the body mass of vertebrates. They consist of elongated cells that contract to generate forces that result in movement. Skeletal muscle is responsible for locomotion and other body movement. 3) Organ systems contribute to the maintenance of the internal environment by maintaining the relatively constant composition and condition of the blood and tissue
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The process of deriving the new drug starts in the laboratory. The chemical formula of the drug are composed in the lab and also called as the vitro testing. This type of testing performed before the drug can be tested on the animals or humans. The vitro testing gives the chemical description of the new drug and formulates the base and additional supplements. After vitro testing is done‚ the vivo testing starts on the animals. This process includes testing to figure out the possible side effects
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Energy • • • • All forms of energy can be converted to heat Thermodynamics – “study of heat changes” Actually a type of kinetic energy Enthalpy (H): Heat content How cells use energy • Excess acquired free energy versus required free energy results in energy storage or growth • Changes in free energy disruptions • Coupled reactions • Chemical work • Electrochemical work • Mechanical work Coupled Reactions • Use of an exergonic process to drive an endergonic one ▫ Photosynthesis and respiration
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A summary of Diffusion of Innovations Les Robinson Fully revised and rewritten Jan 2009 Diffusion of Innovations seeks to explain how innovations are taken up in a population. An innovation is an idea‚ behaviour‚ or object that is perceived as new by its audience. Diffusion of Innovations offers three valuable insights into the process of social change: - What qualities make an innovation spread successfully. - The importance of peer-peer conversations and peer networks.
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AP Biology Introduction and Summary AP Biology is among the most popular advanced placement tests put forth by College Board each year for high school students. The test was designed to challenge and motivate students to further expand on their passion for the subject of biological sciences. AP Biology Course Goals According to College Board‚ the structure for designing a proper AP Biology course should focus on the following topics: • Molecules and Cells: 25% • Heredity and Evolution:
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