Biologia

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  • Publicado : 16 de enero de 2011
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Biology
cells
1. The cell is the basic print of life. The average human body contains over 75 trillion cells. They are two types of cells, one that hasn’t no membrane –bound structures insidethe cell (prokaryotic) and one that does have a membrane – bound structure inside the cell (eukaryotic). Cells are the basic building blocks of all organisms. Plants and animals are made up of one ormore cells. Some organisms, such as bacteria, are made up of a single cell. Other organisms are far more complex, such as your pet dog or even you. Cells are made up of several different parts: outermembrane, organelles and cytoplasm. Outer membrane (cell membrane) is the dictator of the cell. It determines what goes into or out of the cell. Cell functions are accomplished by structures callorganelles. Organelles are specialized parts that moves around the cell and perform functions that are necessary for
Life. Examples of organelles are nucleus, vacuoles and mitochondria. The nucleus is amembrane that contains the cells hereditary information and controls the cells growth and reproduction. Vacuoles are the storage containers of the cell. They may store waste until it is eliminated orfood until is needed. In plants cells, there are large vacuoles that hold water. Energy of the cell is produced by the mitochondria through a process called respiration. Respiration is a series ofchemical reactions that combine food and oxygen to create energy and a waste by-product, carbon dioxide. Plants cells have a cell wall that is made of cellulose. Plant cells also have organelles calledchloroplast; these contain chlorophyll, which uses the process of photosynthesis to make food for the plant cells. The chloroplasts are green; they are what give plants their green color. Light combinecarbon dioxide+water-glucose+oxygen=chlorophyll. The basic difference between plant and animal cells is that plants cells have cell walls and chloroplast, and animal do not. All cells have...
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