temperature will damage the permeability of the plasma membrane. Also‚ the heat will break away the permeability. If the pH solution is 7 or greater there will be no change but the lower the pH the more proteins in the membrane deteriorate. This was believed because its very common that with heat applied to something‚ the ’object’ expands‚ this is seen with metals. Due to this‚ we assumed that the same would happen to animal and plant cells and the cell membrane. It’s also believed that the low pH solution
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high concentration to an area of low concentration. For a diffusion system to be efficient‚ it should have a large surface area so that high amount of substances can be exchanged at a time. It should also have a thin membrane and a continuous supply of substances‚ as a thin membrane means that the diffusion pathway would be short‚ and the continuous supply helps maintain a concentration gradient‚ which is essential for diffusion to take place. There are two main types of diffusion; simple and facilitated
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organelles seen with current light and electron microscopes In light microscopes the organelles that could be seen were cell wall‚ cytoplasm‚ nucleus‚ nucleolus‚ chloroplast‚ water vacuole and cell membrane. * Describe the relationship between the structure of cell organelles and their function 2. Membranes around cells provide separation from and links with the external environment * Identify the major groups of substances found in living cells and their uses in cell activities The major
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for the description of all biological membranes • Transmembrane segments of membrane proteins anchor membrane proteins in the lipid bilayer. • A ganglioside is not a phospholipid. • Thin-layer chromatography separates lipids based on hydrophobicity. • Unsaturated fatty acids have double bonds and increased membrane fluidity. • Cholesterol increases fluidity at low temperatures and decreases fluidity at high temperatures. • Ankyrin is a peripheral membrane protein found in erythrocytes. Therefore
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surface-area-to-volume ratio important for a cell? List the differences between prokaryotic and eukaryotic cells (general structure‚ organelles‚ genetic material‚ etc.). What cellular processes occur in the nucleus? Why is it important for the nucleus to have two membranes and tightly regulated pores? What are these structures called? What is the difference between chromatin and chromosomes? What is the endomembrane system? What are the structural and functional differences between the rough and smooth endoplasmic
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diffusion of water molecules across a selectively permeable membrane involves a special form of diffusion called osmosis. When the external and internal solute concentration are equal‚ there is no movement of water will be observed. This is described as isotonic. Osmosis does not occur in an isotonic solution‚ because the concentrations are equal on both sides of the membrane and there is no net movement of molecules from one side of the membrane to the other (Payne‚ 2007). A hypotonic solution is a
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(see appendix one) is a single-celled organism without a membrane-bound structure‚ meaning it lacks a nucleus‚ mitochondria and any other membrane-bound organelles (Unknown‚ 2015). The Eukaryotic is any cell or organism that has a cell membrane-bound structure. Meaning it contains the major organelles inside a cell (Arrington‚ 2014).
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Tutorial 1 1. pK = 3.4 DH = ASA Plasma pH = 7.3 Stomach pH = 1.5 = 10pH – pK = 10pH – pK = 107.3 – 3.4 = 101.5 – 3.4 = 7943.2823 = 0.01259 [Total Drug] = [D-] + [DH] [Total Drug] = [D-] + [DH] = 7943.2823 + 1 = 0.0126 + 1 = 7944.2823 = 1.0126 [Total Drug] in stomach relative to plasma = 7944.2823/1.0126 = 7845.43 Conclusion: High absorption of ASA from the stomach lumen. Absorption from stomach is 7845.43 times
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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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nucleus Eukaryote = with a nucleus Eukaryotic Cells Cytoplasm (or Cytosol). This is the solution within the cell membrane. It contains enzymes for metabolic reactions together with sugars‚ salts‚ amino acids‚ nucleotides and everything else needed for the cell to function. Nucleus. This is the largest organelle. Surrounded by a nuclear envelope‚ which is a double membrane with nuclear pores - large holes containing proteins that control the exit of substances such as RNA from the nucleus.
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