Why cant we see the Golgi apparatus or the mitochondria in an onion cell specimen?
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Because is a part of a plant and the apparatus of Golgi is an animal structures. They are not cloroplast because it is a root.
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Cells are colorless, so if we want to see them, we need to color them.\nMethylene blue basically stains membranes, so you can use it to distinguish one cell from the other, sometimes you can get a light stain in nucleus, but mainly stains external membranes in vegetable cells, the called cell wall (not present in animal cells)
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A. plant cells do not have centrioles.
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there are several, one is a vacuole. It is used to store soemthing usually food within the cell
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During interphase, the chromosomes are uncoiled, so they are much much thinner.\n\nIn fact, they are so thin that they tend to be less than a wavelength of visible light wide.  So, under a light microscope, they are effectively invisible.
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All organelle sizes in micrometers are available at http://teachersnetwork.org/ntol/lessons/plantcell/index.htm \n\n( scroll down to the table near the end )
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Hey, this is a question I asked my professor, how funny, lol. \n\nFirst of all, it's important to note the differences between a prokaryotic and a eukaryotic cell.  \n\nCells that lack a membrane-bound nucleus are called prokaryotes (from the Greek meaning before nuclei). These cells have few internal structures that are distinguishable under a microscope. Cells in the monera kingdom such as bacteria and cyanobacteria (also known as blue-green algae) are prokaryotes. Prokaryotic cells differ significantly from eukaryotic cells. They don't have a membrane-bound nucleus and instead of having chromosomal DNA, their genetic information is in a circular loop called a plasmid. \n\nTake a look at this picture:  http://library.thinkquest.org/C004535/media/prokaryote.gif\n\nEukaryotic cells comprise all of the life kingdoms except monera. They can be easily distinguished through a membrane-bound nucleus.  Eukaryotic cells also contain many internal membrane-bound structures called organelles. These organelles such as the mitochondrion or chloroplast serve to perform metabolic functions and energy conversion. \n\nTake a look at this picture:  http://library.thinkquest.org/C004535/media/eukaryote_animal.gif\n\nFor a brief and quick response, ...a eukaryotic cell is a larger cell with distinctly more organelles within the cell.  They differ in size greatly :)
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Presence of Mitochondria\nCilia or Flagella used for cellular locomotion\nPresence of RNA
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Try a jello mold and use jello in different colors to represent the organelles.  You can imbed into the jello fruit or candy; for a mitochondrion, use a tubular candy, etc.
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chloroplasts, flagella, contractile vacuoles and the eye spot for starters.
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In an eukaroyotic plant cell the mitochondria is contained in the nucleus. The mitochondria are the "power plants" of the cell. There are three main classes of plant cells: Epidermis, Vascular tissue, and Ground tissue. The second type transports materials through the plant. Since the plant is larger, being a tree, perhaps the longer distance means the cells need more mitochondria to travel that longer distance. In a bush this would not be neccessary. The third type peforms photosynthesis and does starch storage and stuctural support. These types are further broken down into Parenchyma, Collenchyma, and Sclerenchyma. Since it is a larger plant and more starch needs to be stored, perhaps this explains it. More powerhouses would seems to me to be a benefit in greater starch storage for a larger plant. I did not know there could be more mitochondria in one plant cell than in another. Your statement was the first I'd heard of it.
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The cell parts you are looking for are:\n\n1.  golgi body\n2.  lysosome
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this would be the Golgi Apparatus (body)
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plant cells form a disk during the final splitting phase, while animal membranes constrict.  Also, it is easier to see earlier in animals, and animals have centrioles, plants dont.  thats all my textbook says.  the phases and everything are the same, though.
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it's located in the cytoplasm
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in the cytoplasm of the cells
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mitochondria, golgi apparatus, endoplasmic reticulum (smooth or rough)