What is the most studied MTOC in a mammalian cell and what is its main function. This is easy bio-nerds! Who wants 10 points?!
206312
This is a hard one.  I would say it would be the centrosome.  This is the structure from which originate the microtubules that make up the mitotic spindle during mitosis.  At the end of mitosis and cytokinesis the cell has one centrosome; during interphase the one is replicated so that there are two, which will migrate to opposite poles of the cell at the beginning of mitosis.  Microtubules will then assemble, anchoring themselves to the centrioles within the centrosomes as they extend to attach to the pairs of sister chromatids or to meet each other in the middle.  The main function of this MTOC is to participate in cell division.\n\nThe existence and function of this MTOC is something of a mystery, since plant cells do not have them and manage to carry out cell division without them.  Animal cells from which the centrosomes have been removed can also replicate successfully.
504288
the mitochondria...i think
490870
some cells to take in more. Cell permiablility.\n\nhttp://www.answers.com/topic/cell-permeability
277812
Mitochondrial DNA (mtDNA) is DNA that is located in mitochondria. This is in contrast to most DNA of eukaryotic organisms, which is found in the nucleus. Virtually 100% of the mtDNA contribution to a conceptus is inherited from the mother.\n\nUnlike most of the cell, the function of which is defined by nuclear DNA, mitochondria have their own DNA and are assumed to have evolved separately. Human mitochondrial DNA consists of 5-10 rings of DNA and appears to carry 16,568 base pairs with 37 genes (13 proteins, 22 tRNAs and two rRNAs) which are concerned with the production of proteins involved in cellular respiration. However many proteins found in the mitochondria are encoded by nuclear DNA: some, if not most, are thought to have been originally part of the mitochondrial DNA but have since been transferred to the nucleus during evolution.\n\nThere is little change in the mtDNA from parent to offspring, unlike nuclear DNA which changes by 50% each generation. Since the mutation rate is easily measured, mtDNA is a powerful tool for tracking matrilineage, and has been used in this role for tracking many species back hundreds of generations.\n\n\nBoth chloroplast and mitochondria need variety of enzymes for different metabolic reactions.So during evolution a separate DNA is needed for it.Chloroplast is so called a cell inside a cell.
75399
I'm not going to do your homework for you, but I will do my best to give you good links to help you answer the questions yourself.\n\nhttp://www.biology.arizona.edu/CELL_BIO/tutorials/meiosis/main.html\nhttp://www.accessexcellence.org/RC/VL/GG/meiosis.html\nhttp://www.emc.maricopa.edu/faculty/farabee/biobk/BioBookmeiosis.html\nhttp://www.sumanasinc.com/webcontent/anisamples/majorsbiology/meiosis.html\nhttp://biologyinmotion.com/cell_division/index.html\nhttp://www.csuchico.edu/~jbell/Biol207/animations/meiosis.html\nhttp://taggart.glg.msu.edu/bs110/meiosis.htm\nhttp://en.wikipedia.org/wiki/Mendelian_inheritance\nhttp://www.thebiotechdictionary.com/term/triploid\n\nI hope that helps. Most of the links explain meiosis. Some have animations to assist their explanations. The wikipedia article is about Mendel's law of independent assortment. The final link is to the definition of triploid. \nThat should make it easier for you to do the work on your own. By the way, congrats on attending college classes online. (I assume it is a college course.) It is a good idea to use as many resources as you can. When I don't understand subjects in my classes I usually look up the main terms in google.
445611
http://en.wikipedia.org/wiki/Oxidative_phosphorylation\n \nthis site should be useful for that
638175
Cells are the basic building blocks of life. Their main goal is to maintain homeostasis, the way this is done is by using organic and inorganic molecules. Organic molecules are compounds containing carbons, whereas inorganic molecules are compounds that don't have carbon.  \n\nOne of the cells' main function is to make energy. The way it makes energy is via the Kreb Cycle, where it uses  organic molecules such as glucose, and breaks it down into energy ATP  another organic molecule. \n\nAnother function is Reproduction/Replication...cells use RNA (organic molecule) to make DNA (organic molecule).\n\nIf you look at cells on a larger scale, such as tissues...  note that there are four types of tissues: nervous tissues, connective tissue, muscle tissue, and  epidermal tissue.... if you look at the nervous tissue in order for a signal to be transmitted from the brain to the muscle,  neurons have to be able to send the message from the brain to the muscle using action potentials, which use inorganic molecules such as sodium and potassium, in the ion channels in a voltage sensitive gate.  Due to diffusion and osmosis, the ion gates open and close based on concentration levels of sodium and potassium and also based on the action potential. \n\nNote: that you question is very broad and requires not only the knowledge of basic biology but systemic physiology as well. If you want more answers or something you may email me.
317148
Try the websites www.protocol-online.com & www.cellculturechat.com\nThe first has protocols for most scientific applications, the second is a forum specifically for cell culture scientists. Good luck!
513933
http://www.iknow.net/CDROMs/cell_cdrom/index.shtml\n\nCheck this site out! It has both plant and animal cell division! Hope it helps ya!! =o)
494339
the list of activities is endless:\n\nDNA replication, mitosis, protein synthesis, lipid synthesis, protein and lipid metabolism, oxidative phosphorylation, cholesterol synthesis, and on and on and on the list goes . . . . of course it all depends on the type of cell.
128161
You've asked a rather broad question.\n\nHere's a good place to start:\n\nhttp://en.wikipedia.org/wiki/Kingdom_%28biology%29\n\nMore specific questions would be easier to answer.
536813
All the answers Ive seen so far are missing the point.  The answer to your question has to do with the surface-to-volume ratio.  As a cell gets bigger (no matter what the shape of the cell is, being spherical, cuboidal, columnar, what have you...) the volume of the cell gets bigger FASTER than the surface area of the cell.  The surface area is the outermost part of the cell and in the real world, this represents the cell membrane.  \n\nThis is bad news for a cell.  Why?  First you have to realize that the cell membrane is responsible for transporting things into and out of the cell.  Basically then, the inside volume of the cell DEPENDS UPON the cell membrane to provide it with necessary nutrients so it can function.  If the volume grows faster than the cell membrane (as the cell gets bigger), the the cell membrane's ability to function as a provider for the interior of the cell is greatly compromised.  The cell solves this by dividing, to keep its overall cell size relatively small.  \n\nAs far as the agar experiment goes, I dont know but I can give you an idea.  Basically, it sounds like a PROOF of the logic I have given you above.  I imagine that if you cut cubes of agar into different sizes (say a quarter inch cube, half inch, inch and so on) and if you dissolve those cubes in a solvent you will find that they dissolve at different rates.  The length of time that is required to dissolve the cube will be proportional to the VOLUME of the cube.  What you should find is this:  even though the quarter inch cube has a side that is exactly half of the half inch cube, it will take MORE THAN DOUBLE the amount of time for the half inch cube to dissolve (compared to the quarter inch).  Recall that these cubes represent a cell that has grown.  The reason for the prolonged dissolution time is this:  as a cell grows, the surface area increases as the square (area is given in square units),  whereas the volume increases as the cube (volume is given in cubic units).  Since dissolution time is reflective of the volume of the cell, your expectation should be that if you double the area, it will take MORE THAN DOUBLE the amount of time to dissolve the cube since the volume is more than doubled.  Try it and see!\n\nAgain, this is why cells must remain small.  So that the cell membrane can adequately provide the interior of the cell with nutrients.\n\nGood luck with your project.  Hope this helps you some!
341755
Go here:\nhttp://en.wikipedia.org/wiki/Red_blood_cell\nOne thing that I know is that they are the most common cell in the human body hope I was helpful
78572
A whole cell is just that...a whole, not-cut-up, not-pieces-of-other-cells, functioning cell.\n\nThey didn't just take out the cytoplasm.  They didn't just take out mitochondira.  They took the whole cells.
443153
3. mitochondrion\n\nThis is the organell where energy is produced for the cell through the oxygenation of ATP
667271
Try this , it really helped me in my first few lectures in cell bio , such as DNA and RNA . Loads of animations and stuff ! \n\nhttp://www.johnkyrk.com/DNAtranscription.html
507870
i think plant and animal cells both have mitochondria. Because mitochondria is the so called powerhouse of the cell, which means the cell derives its energy from the mirochondria. So plant and animal cells should have it to provide them energy.