Physiology 168 March 14‚ 2014 Diffusion across a Selectively Permeable membrane Introduction: Diffusion is movement of molecules from one area of concentration to another. This process is vital for the life functions of cells. Cells have selectively permeable membranes that allow only certain solutions to pass through them. Osmosis is a special kind of diffusion that allows water to go through semi-permeable membranes of high water potential to a region of lower water potential. Water potential
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Organism Physiology Paper Deborah Chase Biology 101 Professor Y. Henry March 9‚ 2015 Organism Physiology Paper (Chimpanzees) Chimpanzees are hominid species of apes native to Africa and the closest related to humans which they share 95-98% of human DNA. Earlier research reports that the oldest known primates are about 65 million years old with the chimpanzees emerging about 20 million years ago. It is thought that the chimpanzee’s level of intelligence has allowed it to survive
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ethanol on the permeability of beetroot cell membranes. Prediction: By exposing a membrane to a solvent‚ ethanol‚ it will increase its permeability. So the higher the concentration of the solvent‚ the more permeable the membrane will be. But if the concentration of the ethanol is beyond a certain limit‚ it may break down the cell membrane to the point where there is in fact no overall effect as the ethanol would disturb the lipids in the membrane. Therefore‚ more of the red pigment in the
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Designer Babies The first batch of genetically modified babies were created in 2001. Out of the 30 babies that were born‚ 15 were found to have DNA from three different adults. Although having DNA from more than two sources can occur naturally‚ these 15 babies were created with a method called “cytoplasmic transfer‚” which had been banned by the FDA . The method was initially developed to save female eggs that had been difficult to fertilize and was showing much promise—until tracking the growth
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from different species of living organisms‚ bacteria‚ or viruses to get desired traits such as resistance to disease or tolerance of pesticides. How do scientists Genetically modify organisms? Genetically modifying organisms works just like an advanced form of cut and paste. During genetic modification‚ DNA is taken from and unrelated plant‚ animal or bacteria and inserted into a different organism to get it to produce the desired traits. The DNA is“cut” from one organism and “pasted” into and unrelated
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The cell membrane is made up of fats‚ proteins‚ lipids‚ and carbohydrates‚ and is a permeable structure. However‚ this permeation is very discerning because it only lets certain things pass through it. The cell membrane has a layer of phospholipids with hydrophobic ends and hydrophilic tops. The “tails” are made out of phosphate‚ while the “heads” are made up of two strings of fatty acids. There are two layers of these phospholipids‚ called the “bilayer”‚ and the tips of each phospholipid are facing
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Short Essay 2: Genetically Modified Organism Debate A genetically modified organism is used to refer an organism whose genetic material has been changed by genetic engineering techniques‚ which cut and combine DNA molecules from different organism into one molecule (Wikipedia‚ 2012). This way‚ scientists can give it new characteristics that people desire but do not have normally. Since the benefits brought by genetically modified organism are extremely obviously‚ such as lower
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Title: The effect on temperature on beet cell membranes. Introduction A cell membrane or plasma membrane is very important in protecting cells. A cell membrane is a thin layer that protects the cells. The membrane is filled with lipids and proteins. The cell membrane protects the cell from ions and molecules that enter and exit the cells. I hypothesize that at -5 degrees Celsius‚ the color intensity will be a 1. I hypothesize that at 5 degrees Celsius‚ the color intensity will be a 2
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Cell Membrane and Organelle Webquest Name Yamani Woody Using the websites listed‚ answer the following questions. Website #1: http://www.usd.edu/~bgoodman/Membrane.htm http://www.biologymad.com/cells/cellmembrane.htm 1. What invention came along that enabled us to better see the cell membrane? Electron Microscope 2. What are the two parts (list the first two listed) of the cell membrane? Phospholipids and proteins 3. What is one of the cell membrane’s jobs? It controls how substances can
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A planarian is free-living flatworm that lives in fresh water. Planarians are organisms that live in freshwater. Planarians are part of the metazoan phylum. Animals in the metazoan like jellyfish have the ability to regenerate (Raymond 511-512). Planarians are closely related to animals like jellyfish and starfish. These animals shared the same special ability to regenerate; starfish are able to regenerate their arm when it is cut off. Jellyfish are able to regenerate their stinger when cut off (Li
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