Diffusion across Biological Membranes: A simulation Introduction Diffusion is the process by which collisions between molecules cause to spread apart. This movement is described as movement from an area of greater concentration to an area of lower concentration. Hence‚ diffusion continues until the molecules are equally distributed. This is to ensure that molecules have reached a state of equilibrium. Diffusion occurs spontaneously‚ no energy is involved. In cells‚ Diffusion occurs through
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in a hypertonic environment. c. It is sensitive to lysozyme. d. It maintains the shape of the cell. e. None of the above. 3. Which of the following best describes what happens when a bacterial cell is placed in a solution containing 5% NaCl? a. Water will move out of the cell. b. Sucrose will move into the cell from a higher to a lower concentration. c. The cell will undergo osmotic lysis. d. Water will move into the cell. e. No change will result; the solution is isotonic.
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Biology Topic One Maintaining a Balance 1. What are enzymes? Identify their role in metabolism. 2. Enzymes are made up of ____________‚ _____________‚ ______________ and ________________. 3. Enzymes are large __________ that are coiled up to form an ____________ __________. 4. The molecule that the enzyme acts on is called the ______________. 5. Use a model to illustrate how enzymes work. 6. Explain how enzymes
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Chapter 4 Microscopes Two important factors in microscopy are: 1) Magnification: an increase in the object’s apparent size compared with its actual size. 2) Resolving Power: the ability of an optical instrument to show two objects are separate. Three types of microscopes: 1) Light Microscope (LM) M: 1000x RP 0‚2 micrometer (small bacterial cell) 2) Electron Microscope (EM) uses a beam of electrons to resolve electrons‚ better resolving powers than light microscope M:100‚000x RP 0
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Ankur Sindhu Sep 20‚ 2011 CHEM 182-DL1 Prof.: Dr. Nidhal Marashi Lab 1: Colligative Properties & Osmotic Pressure Purpose: The purpose of this laboratory was to gain an understanding of the differences between the freezing points of pure solvent to that of a solvent in a solution with a nonvolatile solute‚ and to compare the two. Secondly‚ osmosis was to be observed to gain a proper understanding of how the principal of dialysis functions. Procedure: 1. Make
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side rises while that in the more-concentrated side falls. When both sides achieve equal water concentration‚ the net exchange becomes zero and the system is said to be at equilibrium. Question 2: Differentiate between a hypertonic and hypotonic Solution: A hypertonic solution refers to a solution that has a higher concentration of solute molecules‚ that is‚ glucose‚ salt etc than that of the cell. Water molecules move across the cell membrane through osmosis to even out the solute
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it is just water. I learned that if there is salt outside‚ it will go inside‚ and the water inside the potato will come out. Since the potato is hypotonic and the outside is hypertonic. And if there is no salt outside‚ the salt that is already in potato will come out and spread. Since in Cup C the water outside is hypotonic‚ and the potato is hypertonic. Sample Calculations Figuring out the change in Percentage
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Data Collection: The aim of this experiment was to test the weight of six potatoes before and after being put into different sucrose solutions. The following data was observed and collected throughout the experiment. Observations: -Qualitative: The potatoes were: Tubed shaped Yellow in color Initially hard in texture -Quantitative: Table 1: Weight of the potato in grams before and after placed in a different concentrations of sucrose solutions. Sucrose solution (M) Weight Before (g) ±
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Julia Babin Ms. Bukola 11/6/2012 Bio Lab W 8 Cell Structure and Function Prokaryotic cells do not contain a nucleus. Eukaryotic cells do contain a nucleus. Organisms are eukaryotic except Bacteria and Achaea. Organelles are small membranous bodies‚ each with a specific structure and function. Prokaryotes do have cytoplasm‚ which is the material bounded by a plasma membrane and cell wall. This contains ribosomes‚ small granules that coordinate the synthesis of proteins
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electrochemical gradient? Against? Which require energy input? Which show saturation kinetics? Competitive inhibition? 4. What can cross the cell membrane by simple diffusion? What cannot? Describe and define diffusion‚ osmosis‚ tonicity (hypertonic‚ hypotonic‚ isotonic—in animals and in plants). What does it cost animal cells not to have a cell wall or water vacuole? Does this demonstrate saturation kinetics? Why or why not? 5. Describe and understand facilitated diffusion in detail. What type
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