and out of the cell by means of diffusion‚ transport proteins and protein channels. Trans membrane proteins transport polar solutes across hydrophobic regions of the bilayer. Diffusion occurs when solutes are transferred from a high concentration of that solute to a lower concentration of solutes. Solutes do not depend on the concentration of other solutes‚ which allows the cell to take in oxygen while releasing carbon dioxide. Osmosis is a special type of diffusion‚ which occurs when water is diffused
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are in constant contact with their external environment. For them‚ gas exchange occurs by diffusion across their membranes. Even in simple multicellular organisms‚ such as green algae‚ their cells may be close to the environment‚ and gas exchange can occur easily. In larger organisms‚ for example animals‚ gas exchange follows the same general pattern as in plants. Oxygen and carbon dioxide move by diffusion across moist membranes. In simple animals‚ the exchange occurs directly with the environment
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Lab 1 Diffusion‚ Osmosis‚ and Water Potential of Glucose Problem: What effects will glucose have on diffusion‚ osmosis‚ and water potential? Background: All living things have certain requirements they must satisfy in order to remain alive. These include exchanging gases (usually CO2 and O2)‚ taking in water‚ minerals‚ and food‚ and eliminating wastes. These tasks ultimately occur at the cellular level‚ and require that molecules move through the membrane that surrounds the cell. There
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AP Bio Lab Report Osmosis and Diffusion Introduction When a substance is released into an area‚ the random movement of its molecules results in a multitude of collisions. These collisions‚ in turn‚ lead to a dispersion of the molecules. The overall movement of the molecules will be from an area of high concentration‚ where there will be more collisions‚ to areas of low concentration‚ where the number of collisions will be much less. This process of dispersion will continue until there is no
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potato strip will be less‚ the mass of the solution will increase as water molecules from outside will diffuse into the cell (diffusion of water molecules from area of higher concentration to area of lower concentration). When the concentration of the sucrose solution outside the potato cells will be more‚ the mass of the potato strip will decrease‚ caused by the diffusion of water molecules from within the cell to outside (higher to lower area of concentration). EQUIPMENT WHY I DECIDE TO
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the membrane through which gases diffuse must be thin. Gas exchange is driven by concentration gradients. Diffusion is the process which moves the gases. The rate of diffusion is determined by the concentration gradient and the distance so having a smaller distance for the gases to travel increases the rate at which gas exchange can occur. A thick membrane would mean a slower rate if diffusion because the gases have to travel further. In this essay I will discuss the diversity in structure and function
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Amateur hobbyists are creating home-brew molecular-biology labs‚ but can they ferment a revolution? $195–$1‚000 $250–$2‚000 MICROCENTRIFUGE $60–$850 IMPROVISATION IS KEY To do molecular biology on the cheap‚ biohackers have developed some creative workarounds: • for a $10 microscope‚ pop the lens o a webcam and stick it back on backwards. • for an $80 centrifuge‚ order the DremelFuge rotor and attach to a Dremel rotary tool. • for a free 37 ºC incubator‚ incubate tubes of E. coli in
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Mechanisms and Permeability: Activity 3: Simulating Osmotic Pressure Lab Report Pre-lab Quiz Results You scored 75% by answering 3 out of 4 questions correctly. 1. Which of the following is true of osmosis? You correctly answered: c. It is a type of diffusion. 2. Which of the following occurs when a hypertonic solution is added to cells? You correctly answered: d. The cells shrink. 3. The variable that affects osmotic pressure is You correctly answered: a. the concentration of nondiffusing solutes
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Application of Molecular Techniques for Detection of Disease Resistant Genes in Tomato Breeding Lines for Guatemala Objectives: 1. Evaluate and modify methods for detection of Fusarium Race 2 resistance gene. 2. Evaluation of two step protocol for detection of Mi-1 gene. 3. Verification of marker for Ty-1 and evaluation for marker in Guatemala breeding lines. (This is a Geminivirus that is transmitted by the whitefly) 4. Use of molecular markers to detect geminivirus resistance source for Gu143
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Week 2 Worksheet – Chapters 3‚ 4‚ and 5 ACROSS 1 The movement of a substance from one place to another due to the substance’s kinetic energy. Diffusion 3 The smallest living structural and functional unit that is enclosed by a membrane. Cell 6 The point at which a substance becomes evenly distributed throughout the solution and the concentration gradient disappears. equilibrium 7 One cell or a group of highly specialized epithelial cells that secrete substances into ducts‚ onto
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