Introduction One of the hallmark characteristics of living things is that they perform chemical reactions. These reactions are collectively known as metabolism. Cells‚ the basic units of life‚ can perform many of these metabolic reactions. In a multicelled organism‚ the cells group together to form tissues that perform the same functions. Tissues group together to form organs‚ and finally‚ several organs exist together in a system. In this lesson‚ we will see how and why this hierarchy is established
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The cell membrane of two strains of Psuedomonas aeruginosa‚ P22 and P201 were treated the sialic acid lectins SNA I‚ WGA‚ MAL and HAA to confirm the presence of sialic acid carbohydrates in the cell surface membranes of these strains. This was done by using two sets of samples-one treated with trypsin and the other without. The sample treated with trypsin showed agglutination for all lectins while the untreated sample showed little to no agglutination. A control was also used with the cells being
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semi-permeable membranes: dialysis tubing‚ eggs‚ and onion cells. Background Information 1. Diffusion is the movement of solutes from high to low concentration. Osmosis is the movement of water from low to high concentration. Both refer to movement in/out of a cell‚ but osmosis refers specifically to water. 2. Isotonic‚ hypertonic‚ and hypotonic all refer to the comparison of concentrations of solutes in verses out of the cell. Isotonic is when the concentration in the cell is the same as the
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Cell Osmotic Fragility‚ Solute Permeability and Diffusion Potentials of Permeable Membranes Introduction This experiment examines cell membrane permeability‚ osmosis and membrane voltages; all of which are important in understanding how cells are affected by their environment. The movement of water across membranes is important for cell volume and thus the volume of extracellular compartments. The mechanisms for solute transport are essential in maintaining cell functions and homeostasis. Furthermore
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3. Hold the spreader at an angle of approx 30oC and push it along the slide‚ spreading the drop of blood into a smear. 4. Label the slide with the patient’s details and allow it to air dry‚ so the cells stick to the slide 5. Fix the slide using alcohol‚ this preserves the cells 6. Stain the slide using a Romanowsky stain‚ e.g. Wright’s or Leishman’s. The stain is poured over the slide‚ left for approx 2 minutes and the excess is washed off with water. Differential stain
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plant cell wall and plant cell membrane. Make sure to include whether each structure is hydrophobic or hydrophilic. The plant cell wall contains cellulose and the membrane contains phospholipids. Cellulose is hydrophilic‚ meaning that it likes and is attracted to water. The phospholipid bilayer that makes up the cell membrane is both hydrophilic and hydrophobic. It contains hydrophilic heads that face the outside of the bilayer‚ and hydrophobic tails that face the inside of the membrane. The heads
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plant and animal cells are placed in a hypotonic environment‚ osmosis will occur. The structure of these cells determines the response to the difference in gradient‚ whether this be lysis (the explosion of cells due to the sudden increase in water pressure within the cell) in animal cells or turgor pressure (the pressure created by the increase in water pressure within the cell) in plant cells. Turgor pressure prevents further osmosis‚ which causes the water potential outside the cell to be lower than
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a huge part of your cell membranes. They have quite a few roles in our body‚ such as helping an unborn babies lungs develop. 3. Find out where in the human body your macromolecule is found. Be specific. If it is found in cells‚ explain where it is in the cell and what is does for the cell. a. Lipids make up the cell plasma membrane and the nuclear membrane. Steroids are also lipids‚ and they are hormones that act as signaling molecules. You can find lipids in all cells in your body because
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Answer ALL the questions. 1. Discuss briefly fluid mosaic model for membrane structure. (6 marks) Answer: The lipids and most of the protein in the plasma membrane are free to bob about‚ sliding from one location in the membrane to another. Because lipids and proteins move about laterally within the membrane‚ the membrane is a fluid mosaic of lipids and proteins. The membrane fluid is since the composition of any location on the membrane can change. In the same manner that a patchwork quilt is mosaic
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transport 8. apocrine sweat gland duct is what cell type? Simple cuboidal? 9. medial meniscus needs synovial fluid from neighboring synovial joint 10. know graft rejection! It is mediated by lymphocytes‚ specifically by T cells 11. ATP is required for the relaxation of skeletal muscle 12. dense bodies in smooth muscle are analogous to Z lines in skeletal muscle 13. (a drawing showing empty vesicles floating towards a membrane and fusing with it) membrane formation (not exocytosis!) 14. cones are
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