Nucleus The nucleus is the largest of the organelles and is enclosed by a nuclear envelope. Aspinall/Cappello (2015) describe the nucleus as ‘the information centre of the cell’. The nuclear envelope has two membranes which has nuclear pores – the pores are in charge of exchanging materials between the cytoplasm and the nucleus. The envelope contains phospholipids, this forms a lipid bilayer which helps to maintain the nucleus’s shape. This also helps with the movement of molecules in and out of
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As the manager of the "cell team", i decided that the most valuable player is the cell surface membrane. Also known as plasma membrane, the cell surface membrane consists of a double layer of phospholipids. The hydrophilic heads of phospholipids face outwards into the water while the hydrophobic tails face inwards pointing each others. The two layered structure is known as the phospholipid bilayer. Intrinsic proteins will be found at the phospholipid bilayer to allow the transport of certain substances
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Plant Anatomy = the study of plant cell and tissue structure Plant cell structure “Cell” - originally coined by Robert Hooke, in 1600’s. Cell theory: 1) All life made of cells 2) Cells arise from pre-existing cells 3) Cells units of metabolism 4) Cells contain complete DNA, hereditary substance. Cell structure Ergastic substances = by-products of metabolism amyloplasts - starch grains = polymer of alpha-glucose 2 forms of glucose Ergastic substances chromoplasts - pigmented
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When we eat breads, potatoes, and cakes, we convert it to glucose. These don’t break down to glucose as easily, so they tend to get stored and are only broken down when there is not enough glucose available. c) CELLULOSE is only found in plant cell walls, and gives plant stems and leaves their firmness. Our body is unable to break down this substance, so it just passes through our digestive tract. That is what is referred to as eating fiber. It helps a person who
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complexity? A) ecosystem, population, organ system, cell, community, molecule, organ, organism, tissue B) cell, molecule, organ system, organ, population, tissue, organism, ecosystem, community C) organism, organ system, tissue, population, organ, community, cell, ecosystem, molecule D) molecule, cell, tissue, organ, organ system, organism, population, community, ecosystem E) ecosystem, molecule, cell, tissue, organism, organ system, organ, community
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influence of various alcohols and temperature on the permeability of beetroot cell membrane. The different types of alcohol will include ethanol, methanol, propanol, butanol and the tissue from the beetroot will be exposed different salt concentrations (0%, 5% ,10% and 20%) . The stress affecting the membrane’s permeability will be assessed by the amount of leakage of pigment caused. ‘Homeostasis the ability of the body or a cell to seek and maintain a condition of equilibrium or stability within its
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Assignment on Complexity of Human Cell The universe is alive with movement: moons rotating around planets, planets orbiting stars, gaseous rings rotating and expanding, meteors and comets soaring through space at great speeds; and all the while the entire universe are expanding at an accelerated rate. Thankfully for us, it is not a dance of chaos; gravity governs the dance, allowing stars, planets and moons to move coherently to one another. In like manner, there is a vast micro-universe softly
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MICROBIOLOGY 2051 BRINNINSTOL Characteristics of Cells: true of all living cells * Communicate with environment * Molecules being exchanged—recognized by other cells—causes cell to do something (releasing toxins; move) * Growing—one cell divides and becomes two cells (binary fisson) * Some form appendages—form differently, look dfrnt, function dfrnt—spores, cysts, flagella * Evolve—ancestral cell Microbial Communities Table 1.1 More water than land
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There are two types of cell transport mechanisms. These types of transports are passive and active transport. The difference between active and passive is that passive does not require energy and active does require energy. The reason passive does not require energy is because it travels down a concentration gradient. On a concentration gradient molecules naturally move from high to low concentration. In active transport, molecules move from low to high concentration. There are three different types
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The cytoplasm and extracellular environment of the cell are aqueous solutions. They are composed of water, which is the solvent, or dissolving agent, and numerous organic and inorganic molecules, which are the solutes, or dissolved substances. Organelle membranes and the plasma membrane are selectively permeable, allowing water to freely pass through but regulating the movement of solutes. The cell actively moves some dissolved substances across membranes, expending adenosine triphosphate (ATP)
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