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1. The cell theory states that 1) all living organisms are composed of one or more cells; ) the chemical reactions of a living organism, including its energy-releasing processes and its biosynthetic reactions, take place within cells; ) cells arise from other cells; and 4) cells contain the hereditary information of the organisms of which they are a part, and this information is passed from parent cell to daughter cell. Because cells are the basic units of life, this theory plays an important role in biology. Cells make up every living thing, and without this information, human medicine and technology would not be nearly as advanced as it is today. The cell theory disproved many old theories, such as that of spontaneous generation. The information that was gathered from this theory made us realize that all organisms have something in common, and this paved the way for evolution and many of today’s modern day theories.
. Plant cells differ from animal cells in that they develop one or more liquid-filled cavities, called vacuoles, within the cytosol. These are necessary for the plant to save energy and to increase the space between the cytoplasm layer and the external environment. Another difference between plant and animal cells is that plant cells have chloroplasts. Chloroplasts are the sites of photosynthesis and contain chlorophylls. Unlike in animals, these are necessary for the plant to make its own food. The third distinguishing characteristic is the cell wall. Animal cells have a plasma membrane. The cell wall limits the size of the protoplast, therefore preventing rupture of the plasma membrane when the protoplast grows. The cell wall also plays important roles in absorption, transport, and secretion of substances. They also are active in defense, and determine size and shape of the cell.
. Mitochondria and plastids are semiautonomous organelles. This means that they contain the components necessary for the synthesis of some of their own proteins. The DNA in mitochondria and plastids is seen as circular molecules in the nucleoids. Genetic information is found in the nucleus, plastid and mitochondrion. The nuclear genome accounts for most genetic information in the cell. Plastids and mitochondria are able to code for some of their own polypeptides.
4. Mitochondria and chloroplasts evolved from bacteria. It is thought that mitochondria and chloroplasts originated as bacteria and lived inside heterotrophic cells. Bacteria are prokaryotic. During the increase in free oxygen in the atmosphere, eukaryotic cells, such as chloroplasts and mitochondria, first appeared. Almost all modern eukaryotes contain mitochondria, and all autotrophic eukaryotes contain chloroplasts. Mitochondria and chloroplasts are also similar to bacteria in that they are all similar in size, they contain DNA, and are able to self-replicate.
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5. Vacuoles play many essential roles. One important role of the vacuole is to develop internal pressure and therefore maintain the rigidity of tissues. They do this by taking up a large portion of the cell, which saves energy in the form of nitrogen-rich cytoplasmic material, and creates more surface between the cytoplasm and the cell’s external environment. Another role played by vacuoles is that of storage. Primary metabolites, such as sugars and organic acids and the reserve proteins in seeds are stored in vacuoles. Pigment deposition also takes place in vacuoles, as well as the breakdown of macromolecules and the recycling of their components. Vacuoles also remove toxic secondary metabolites, such as nicotine and tannin, from the rest of the cytoplasm.
6. Chromoplasts, or pigmented plastids, lack the chlorophyll which give plants their green color. However, they synthesize and retain carotenoid pigments, which create the colors of fall leaves. It is possible that these chromoplasts develop from previously existing green chloroplasts during which chlorophyll and internal membrane structure of the chloroplast disappear and carotenoids accumulate. This often occurs during the ripening of many fruits. Anthocyanins also cause the leaves to change into a red color in autumn. They form in cold, sunny weather, during which the leaves stop producing chlorophyll. Cartenoid pigments in other leaves unveil a yellow-orange color when the chlorophyll stops producing. These pigments already exist in the chloroplasts.
7. Rough endoplasmic reticulum is found in cells that store proteins. Cisternae containing many ribosomes is also a characteristic of RER. Smooth endoplasmic reticulum is found in cells that secrete lipids, and is generally tubular in shape. Both rough and smooth endoplasmic reticulum occur within the same cell and have numerous connections. However, RER is involved in membrane and protein synthesis, whereas SER is involved with lipid synthesis.
10. Plant cells have a primary, and many times a secondary, wall. This secondary wall occurs inside the primary wall. The cell wall is made mainly of cellulose. During cell growth, repeating monomers of glucose attached end to end come together to form microfibrils. These microfibrils wind together to form strong coils. Cellulose microfibrils are synthesized by cellulose synthase complexes in the plasma membrane. They appear as rings, or rosettes. During cellulose synthesis, the complexes extrude the microfibrils onto the outer surface of the membrane. The microfibrils are then integrated into the cell wall. The cortical microtubules guide this movement. Secretory vesicles insert the rosettes into the plasma membrane. The secretory vesicles also carry the glycoproteins and matrix substances, which include hemicelluloses and pectic substances, to the wall.
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