what is the functions of the centrosome?
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The centrosomes function by creating centrioles, which are the fibers that pull the cell apart during mitosis. It is like the draw string of the cell that splits it in two.
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Wikipedia! \n\nLysosomes have different uses, the amount in a cell changes depending on the part of life the cell is going through. Near mitosis, there are more lysosomes to assist with the process.
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Keep the cell contents bound together,exchange gases and excreta,Semi permeable entry i.e. it protects the cell by allowing only some Substances to enter the cell, maintains the shape of the cell and helps in transfer of water from cell wall as it has hydrophilic proteins in plants
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Prophase I\nIn the leptotene stage, the cell's genetic material, which is normally in a loosely arranged pile known as chromatin, condenses into visible threadlike structures. Along the thread, centromeres are visible as small beads of tightly coiled chromatin. Recall that centromeres are connection sites between sister chromatids, which are not yet distinguishable. As the chromatin becomes progressively ordered and visible, homologous chromosomes find each other and bind together. In this process, called synapsis, a protein structure called the synaptonemal complex attaches the homologous chromosomes tightly together all along their lengths.\n\nThe zygotene stage sees the completion of synapsis. The paired homologous chromosomes are said to be bivalent. They may also be referred to as a tetrad, a reference to the four sister chromatids. During this stage, one percent of DNA that wasn't replicated during S phase is replicated. The significance of this cleanup act is unclear.\n\nThe pachytene stage heralds crossing over. Nonsister chromatids of homologous chromosomes exchange segments of genetic information. Because the chromosomes cannot be distinguished in the synaptonemal complex, the actual act of crossing over is not perceivable through the microscope.\n\nDuring the diplotene stage, the synaptonemal complex degrades. Homologous chromosomes fall apart and begin to repel each other. The chromosomes themselves uncoil a bit, allowing some transcription of DNA. They are held together by virtue of recombination nodules, betraying the sites of previous crossing over, the chiasmata.\n\nChromosomes recondense during the diakinesis stage. Sites of crossing over entangle together, effectively overlapping, making chiasmata clearly visible. In general, every chromosome will have crossed over at least once. The nucleoli disappears and the nuclear membrane disintegrates into vesicles.\n\nDuring these stages, centrioles are migrating to the two poles of the cell. These centrioles, which were duplicated during interphase, function as microtubule coordinating centers. Centrioles sprout microtubules, essentially cellular ropes and poles, during crossing over. They invade the nuclear membrane after it disintegrates, attaching to the chromosomes at the kinetochore. The kinetochore functions as a motor, pulling the chromosome along the attached microtubule toward the originating centriole, like a train on a track. There are two kinetochores on each tetrad, one for each centrosome. Prophase I is the longest phase in meiosis.\n\nMicrotubules that attach to the kinetochores are known as kinetochore microtubules. Other microtubules will interact with microtubules from the opposite centriole. These are called nonkinetochore microtubules
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Organelle biogenesis is crucial for cell function, cell integrity and cell survival in both normal and pathological situations
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Both are eukaryotic (containing a "true nucleus").  \n\nAnimal Cells lack a cell wall and adjacent cells are connected by junctions (adhesive, gap or tight).  Animal cells contain centrioles (help create microtubules used in mitosis and meiosis) and lysosomes (organelles used to digest wastes and old organelles). During telophase and cytokinesis the cells separate via a cleavage furrow.\n\nPlant Cells contain a cell wall (think of the cell wall as the "skeleton" composed mainly of cellulose) and rely on turgor pressure to keep them upright.  Adjacent cells are connected by channels called plasmodesmata.  You will not find centrioles or lysosomes in a plant cell, but you will find a really cool organelle called a large centrol vacuole.  This organelle is where the water is stored in a cell and it helps maintain the turgor pressure described above.  It also acts as a lysosome, storing chemicals and waste products.  The Central vacuole can also store the pigments you see in flowers as well as poisons used to deter predators.  And of course, in a plant cell you will find the plasts as mentioned by someone earlier.. including the famous chloroplasts (the site for photosynthesis) as well as the chromoplasts (contain pigments) and amyloplasts (specialized for starch storage). During telophase and cytokinesis, the cells are separated by a structure called a cell plate.   \n\nUmmm, that's all I can come up with right now!
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The cytoplasm containing the other cell parts.
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Flagella and cilia allow the cell to move around.  Flagella spins around like a helicopter blade allowing propusion, and the cilia are like little hairs all over the cell and beat in unison.  Cilia can also be used to direct the flow of food into the gullet.
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Lysosomes are responsible for getting rid of damaged organelles in the cell by digesting them. They even digest whole cells if they are damaged. SO if you've got cell damaage, lysosomes get rid of that damage.
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The endomembrane system is the system of internal membranes within eukaryotic cells that divide the cell into functional and structural compartments, or organelles. Prokaryotes do not have an endomembrane system and thus lack most organelles.\n\nThe endomembrane system also provides a transport system, for moving molecules through the interior of the cell, as well as interactive surfaces for lipid and protein synthesis. The membranes that make up the endomembrane system are made of a lipid bilayer, with proteins attached to either side or traversing them.\n\nThe following organelles are part of the endomembrane system:\n\n    * The plasma membrane is a phospholipid bilayer membrane that separates the cell from its environment and regulates the transport of molecules and signals into and out of the cell.\n    * The nuclear envelope is the membrane around the nucleus of the cell.\n    * The endoplasmic reticulum is a synthesis and transport organelle [the endoplasmic reticulum is an extension of the nuclear envelope].\n    * The Golgi apparatus acts as the packaging and delivery system for molecules.\n    * Lysosomes are the "digestive" units of the cell. They utilize enzymes to break down macromolecules and also act as a waste disposal system.\n    * Vacuoles act as storage units in some cells.\n    * Vesicles are small membrane-enclosed transport units that can transfer molecules between different compartments.
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the nucleus of the cell controls and coordinates all the work of the cell. this takes care of composition.the cell wall and the cell membrane proects the cell
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(for animal cells..)\n1. non-kinetochore microtubules lengthen. this elongates the cell even more than before.\n2. pairs of sister chromosomes attach at opposite ends of the cell.\n3. new nuclear envelopes form around the two sets of dna at the opposite ends of the cell.\n4. cytokinesis (division of cytoplasm) occurs and the plasma membrane re-forms around the two daughter cells.
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In cell biology, the nucleus (from Latin nucleus or nuculeus, kernel) is found in all eukaryotic cells and contains the nuclear genes which form most of the cell's genetic material. Nuclei have two primary functions: to control chemical reactions within the cytoplasm and to store information needed for cellular division.
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animal cell\ncell membrane - controls what moves in and out of the cell\ncytoplasm - the jelly like substance the organelles sit in\nnucleus - controls the actions of the cell\nlysosome - structure with digestive enzymes that break down wornout cells and debris\nvacuole - stores food, water, and wastes\nnuclear membrane/envelope - controls what moves in and out of the nucleus\nribosomes - synthesize and produce proteins\nendoplasmic reticulum - synthesizes materials and transports them to other parts of the cell\ngolgi body - packages and modifies materials and sends them to other cells\nchromatin - genetic information that tells the what to do\nnucleolus - knot of chromatin that produces ribosomes\nmitochondria - produces energy for cell\n\nPlant cell ( added on )\ncell wall - a rigid layer that gives shape and supports the cell\nchloroplasts - absorbs sunlight needed for photosynthesis
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There are actually TWO organelles that play a direct role in the process of cell division.\n\nThe centrioles are the structures that establish the poles during mitosis and meiosis. But don't forget the cytoskeleton, which is hugely important during the cytokinesis part of each process.
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The main function of chloroplast is to absorb sunlight in order for photosythesis to take place. The chloroplast consists of many thylakoids that contain a photosynthetic pigment called chlorophyll. The photons from the light react with this chlorophyll in the chloroplast to give rise to photosynthesis.\n\nHope that helps!
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The centrosome is definitely necessary for mitosis because the centrosome is the microtubule organising centre for the cell. All microtubules are generated from the centrosome.