Biology Sumery

SOME PRINCIPLES OF BIOLOGY cells and tissues Cell structure Cytoplasm blockheaded liquid with particles in it. Particles exp iodinent be oil droplets or organelles. chemic reactions take key in the cytoplasm. Cell membrane rationalize layer of proteins around the cadre. It controls the center fields that are allowed to enter and leave the cell and maintains the cell structure. Nucleus It controls the type and meter of enzymes produced by the cytoplasm, so it regulates the chemic reactions. It controls cell division: a cell without substance cant reproduce. Inside the nucleus are chromosomes. Mitochondria petite organelles which are most numerous in regions of rapid chemic activity. They are responsible for producing energy from nutriment substances. Plant cells They bemuse a cell wall make of cellulose which allows water and turn substances to pass through. Mature plant cells declare a vacuole. The vacuole is enough by cell sap, a faded solution o f sugar, salts and pigments. They arrest plastids in the cytoplasm. If they contain chlorophyll, they are called chloroplasts. dull plastids contain starch. Cell division and cell specialization Cell division each(prenominal) cell in growing regions divides to produce two young wench cells.

These cells might divide again, but usually one of them changes and becomes fitted to do one particular job; it becomes specialized and loses its advocator to divide. Growth: result of cell division, followed by cell blowup and, in many cases, cell specialization. Specialization of cells They do one parti cular job. They develop a different ! shape. Special kinds of chemic change take place in their cytoplasm. Nerve cells occupy electrical impulses to and from the brain Long to connect distant part of the body. Their chemical reactions cause the impulses to travel along the fibre. Guard cells of a stoma on the loose(p) or close the stomatal boil down in a leaf. Curved shape and unevenly indurate cell walls. Changes in carbon...If you want to get a wide essay, order it on our website: OrderCustomPaper.com

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