... . Most of all, both structures, the city and the cell have a huge amount of importance. One of the most important parts of the plant cell is its nucleus. It is the control center of the cell, where every other function of the cell is controlled. In New York City, the control center is ... determined whether immigrating people were allowed to come into the country or not. Looking closer into the run of the city you see a transportation system, banks, a power plant, bridges, computers, phones, post office trucks, lots and lots of food. All these things are necessary for a developed city to ...

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• Grade Level: High School

... functions, a substance can be concentrated in an area or excluded from an area. In addition, the plasma membrane at the cell's boundary must serve a third function - communication with other cells. The cell's boundary membrane provides this cell-to-cell communication via glycoprotein surface markers. The phospholipid bilayer, because of its non-polar, hydrophobic tails, is a barrier to many large ... opposite direction (high to low concentration), moving against a concentration gradient isn't easy. It's a lot like pushing a rock up a hill - it takes energy. Other proteins function as door...

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• Grade Level: High School

... an increase in the surrounding temperature has on the plasma membrane of a typical plant cell structure. Hypothesis: An increase in temperature will damage and denature the plasma membrane and cause the cytoplasm and other substances contained within the membrane to leak out. Introduction: The purpose of a cell membrane is to control the transport of substances moving into and out of ... one molecule of glycerol chemically linked to three molecules of fatty acids. The majority belongs to one subgroup of triglycerides known as phospholipids. Despite their many differences in appearance a...

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... effecyThe Effect Of Temperature On A Plasma Membrane Aim: This experiment aims to determine what effect an increase in the surrounding temperature has on the plasma membrane of a typical plant cell structure. Hypothesis: An increase in temperature will damage and denature the plasma membrane and cause the cytoplasm and other substances contained within the membrane to leak out. Introduction: ... one molecule of glycerol chemically linked to three molecules of fatty acids. The majority belong to one subgroup of triglycerides known as phospholipids. Despite their many differences in appear...

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... 2 pounds a week. Quick and easy weight-loss diets are fads ;because most are unbalanced, puting emphasis on one kind of food and excludeing others. To function, humans must have nutrients. The most important nutrients for people are proteins, carbohydrates, fats and oils, minerals, vitamins, and water. Proteins are made up of amino ... except for water and, maybe, fat. Animal foods such as meat, fish, poultry, milk, and eggs are rich in protein. Good plant sources of protein are beans, peas, nuts, bread, and cereals. Combining plant sources, such as peanut butter with whole-grain bread ...

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... use in plants and animals Both proteins and carbohydrates are of vital importance to the living world. Proteins are essential to maintaining the structure and function of all life. The word itself is derived from the Greek word "protos" meaning primary. Proteins are vital for the growth, repair, and ... chains with iron; they are modified by being linked to mineral ions. Other proteins can be linked to carbohydrates to form glycoproteins. Its function is to inhibit the enzyme elestate produced by white blood cells to keep elastic tissue in the lungs intact. Globular proteins are tertiary...

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... acids. These acids are important to our bodies because they help in the construction of muscle tissue, enzymes, haemoglobin and many parts of the cell such as DNA. - Carbohydrates: Carbohydrates are made up the elements carbon, hydrogen and oxygen and they provide our bodies with a readily available ... the amounts that are present in the food they consume. The nutritional value of different foods is affected by: The species or type of plant or animal. Where and how they are grown or reared. The effect of harvesting and slaughter. The time taken to transport food to ... Folic acid, Bioti...

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... carbohydrate. It is a branched structure of thousands of glucose residues. In vertebrates it is characteristically found as tiny granules in liver and muscle cells. Cellulose is the structural component of plant wall cells. It consists of long chains of glucose residues. Hydroxyl groups project outwards to form hydrogen bonds with hydroxyl groups of adjacent chains; this gives the whole structure a ... high tensile strength. Cellulose is fully permeable to water and solutes and therefore dos not affect exchange of materials between the cell and environment. Chitin is structurally very si...

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... up enzymes and catalysts that are mandatory for essential biological processes to occur. Also, organic compounds are responsible for governing ion transport channels in the cell, which function in carrying information from one cell to another, and mediating cell-to-cell communication. Failure of ion transport may result in the failure of an important biological process in the body. Pharmaceuticals are another example of mainly ... , glass fragments, etc), and present credible evidence vital to the process of persecuting a crime. Agricultural and food chemistry uses both organic and analy...

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• Grade Level: Undergraduate

... the normal protein is expressed within normal brain tissue and encodes a protein that resides at the surface of nerve cells. The function is unknown. The mutated prion version of the protein accumulates within nerve cells, forming aggregates that kill cells. The normal protein ... a step closer to the ultimate goal, a cure for a disease. Bibliography Bibliography Alberts B, Bray D, Lewis J, Raff M, Roberts K, Watson JD. Molecular Biology of the Cell, 3rd Edition. New York: Garland Publishing, Inc., 1994. Chesebro, B. 1998. BSE and prions: Uncertainty about the agent. Science 279: 42-43. ...

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How the Molecular Structure of Carbohydrates, Proteins and Lipids affect their function in living things. Living cells contain many small molecules such as water and inorganic ions like nitrogen. They also contain a vast number of larger molecules, called macromolecules that are built ... immediate supply of glucose is used up the body restores its supplies by breaking down glycogen. Cellulose is an example of a structural polysaccharide, and it gives strength and rigidity to plant cell walls. Cellulose molecules are long unbranched chains of containing glycosidic linkages of B-glucose. The ...

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• Grade Level: Undergraduate