The Biological Importance of Lipids Lipids are organic compounds found in all types of plant and animal cells. They always contain carbon‚ hydrogen and oxygen‚ however the relative amount of oxygen is less than the amount of carbohydrates in lipids. Lipids are polymers and the long chains of repeating units are joined together in a condensation reaction where water is also produced. The most common types of lipids are triglycerides‚ phospholipids and waxes. Triglycerides are formed by three fatty
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In this lab we will look at how molecules move across the membrane of a cell . Osmosis is the movement of water across a cell membrane.In osmosis the cell membrane is selectively permeable‚which allows for the membrane to control what types of substances that passes through.Transportation can either be passive or active.Passive transport does not require the use of added energy where as active transport requires the cell to use energy. Diffusion is the simplest form of passive transport. Using
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Molecules Across Cellular Membrane Abstract: Cell membranes play an important role in regulating what goes in and out of the cell. Diffusion‚ the process of movement of substances across the cell membrane from higher concentrations to areas of lower concentration‚ plays an active role in the transport and the regulation through cellular membrane. Sometimes‚ there are cases when cells are placed in hypotonic solutions and substances will diffuse through the cell membrane too much and will result the
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cells and platelet cells: A review. Retrieved March 27‚ 2017‚ from http://www.ghrnet.org/index.php/JT/article/view/1340/1795 Materials Research Society‚ 35(5)‚ 382–388.Web. 8 Mar. 2017.Web. 26 Mar. 2017. Kimball‚ John W. "Transport Across Cell Membranes." Kimball’s Biology Pages. N.p.‚ 17 Apr. 2014. Web. 8 Mar. 2017. R. I. Macey‚ Transport of water and urea in red blood cells American Journal of Physiology - Cell Physiology Mar 1984‚ 246 (3)C195-C203;Web. 26 Mar.
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the water potential outside the cell to be lower than that inside the cell. When placed in a hypertonic environment‚ the gradient in animal and plant cells are reversed and water exits the cell. This sudden release of water results in a shrinking membrane‚ called crenation‚ which
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to investigate and understand the affect different temperatures have on cell membrane structures. Hypothesis The higher the temperature is‚ the higher the rate of absorbance of the cell membrane will be. Variables Controlled Variables | Independent Variables | Dependent Variables | The length of the beetroot placed into the test tube. | The temperature of the water bath. | The absorbance of the cell membrane of the beetroot. | Time placed into the hot water bath after the beetroot was
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Peter Agre’s Discovery Figure Page Figure 1: Figure 2: Upon deciding a topic for an ideal Nobel laureate‚ I had to meet two criteria I decided for myself. Aside from the topic having to be science related‚ I decided that the laureate could not be well know‚ such as Watson or Einstein‚ and also it should be a science topic that I have found the most intriguing since entering college which happens to be the human body. Even with such a broad topic as the human body I came across a laureate
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Liposomes Definition and background10 Liposomes were discovered in the early 1960’s and subsequently studied as cell membrane models. They have since gained recognition in the field of drug delivery. Liposomes are spherical vesicles which can be thought of as a hollow sphere they are composed of a bilayer membrane which entraps an aqueous core. The particle size of liposomes ranges from 20 nm to 10 μm in diameter. Liposomes vary in charge and in size depending on their manufacturing protocol
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absorption of fats‚ while the most vital function of that is to make up the membrane structure of every cell in the body (Stanfield‚ 2010).The living cell is being separated from its surroundings by plasma membrane‚ consisting of phospholipid bilayer which has a fluid structure (Stanfield‚ 2010). It is very important that the plasma membrane to retain its fluidity under specific environmental conditions. If the membrane solidifies or if it is too fluid‚ the function of some proteins in it may become
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Biology 1010 8/27/13 Life: * Order: Pine Cone‚ Bacteria – where things are * Regulation: Regulate their internal environment * Maintain homeostasis * Ex. Breath‚ too much CO2‚ changes pH Sends message to brain * Growth and development: Definite pattern to growth and development * Directed by DNA (genetic material where the genes are found) * Energy processing: All organisms must have energy * Humans: Food (Heterotrophs = other-feeding (fungi and
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