What do cell walls of diatoms contain?
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The cell walls of diatoms (the frustule) are made of 95% silica (basically glass), and pectin. If you mean what type of energy storage is in the diatom, than its the compounds chrysolaminarin and oil. (pretty sure you wanted the first one)
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The rigid cell wall in plants prevent bursting or shrivelling because, when water enters the cell, the plasma membrane cannot expand past the cell walls. Similarly, in hypertonic situations, the plasma membrane will just tear away from the cell wall. The cell does not lose its shape because the cell walls are still there and in the same shape.
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Some algae are motile. Single-celled algae often have flagellae and move in a spiralling manner. Others do not have flagellae but secrete a sticky substance which attach them to the substrate, enabling them to glide along leaving a trail of slime behind.\n\nSome Diatoms (pythoplankton) can also move on their own thanks to their flagellae.  Then there's the rhodophyta and the cyanobacteria, which are not exactly plants but will also enlighten your way to finding what you need.\n\nOtherwise, plant cells are not moile.
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A plant or bacterial cell that has had its cell wall removed\n\nwww.ncbiotech.org/biotech101/glossary.cfm\n\nfluid living content of a cell, the cytoplasm and nucleoplasm.\n\nwww.mycolog.com/GLOSSARY.htm
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I am working on this problem without knowing if you even still need this info. But it is interesting. It seems the most important inorganic nutrient is sunlight!\n\nHere's a quote:\n\nAutotrophs absorb sunlight energy and transfer inorganic mineral nutrients into organic molecules. The autotrophs of the marine environment include algae and flowering plants and in the deep sea are chemosynthetic bacteria that harness inorganic chemical energy to build organic matter...AUTOTROPHIC NUTRITION..supply food molecules to organisms that can't absorb sunlight.\n\nfrom:http://darter.ocps.net/classroom/klenk/Ecology.htm\n\nHere's another link relative to the subject, I think:\nhttp://pubmedcentral.com/articlerender.fcgi?artid=18283\n\nThe oceanic distribution of cadmium follows closely that of major algal nutrients such as phosphate. The reasons for this “nutrient-like” distribution are unclear, however, because cadmium is not generally believed to have a biological function. Herein, we provide evidence of a biological role for Cd in the marine diatom Thalassiosira weissflogii under conditions of low zinc, typical of the marine environment. Addition of Cd to Zn-limited cultures enhances the growth rate of T. weissflogii, particularly at low pCO2. This increase in growth rate is reflected in increased levels of cellular carbonic anhydrase (CA) activity, although the levels of TWCA1, the major intracellular Zn-requiring isoform of CA in T. weissflogii, remain low. 109Cd label comigrates with a protein band that shows CA activity and is distinct from TWCA1 on native PAGE of radiolabeled T. weissflogii cell lysates. The levels of the Cd protein are modulated by CO2 in a manner that is consistent with a role for this enzyme in carbon acquisition. Purification of the CA-active fraction leads to the isolation of a Cd-containing protein of 43 kDa. It is now clear that T. weissflogii expresses a Cd-specific CA, which, particularly under conditions of Zn limitation, can replace the Zn enzyme TWCA1 in its carbon-concentrating mechanism.\n\nMarine microorganisms are largely responsible for the cycling, and therefore the distribution, of many nutrients in the sea, and it is the availability of these nutrients that, in turn, controls oceanic primary production. This relationship is as true of essential trace elements as it is of major nutrients. In oceanic systems, the water column distribution of many biologically important trace metals is thus similar to that of the major nutrients: phosphate, nitrate, and silicate. At the surface, where photosynthetic activity depletes algal nutrients, such metals are present at extremely low concentrations, presumably as the result of biological uptake. Like those of major nutrients, these metal concentrations increase at depth because of decomposition of organic matter and remineralization.\n\nZinc, which has many known biological functions (1), is a good example of a metal that follows this type of nutrient-like profile. Cadmium, however, which is generally thought to be universally deleterious to living organisms, also has a nutrient-like profile (2); its concentration is so well correlated to that of phosphate that the accumulation of Cd in the fossilized tests of marine invertebrates is used as a measure of past nutrient concentrations in the sea (3). In the absence of a demonstrated biological function for Cd, it has been widely thought that abiotic processes, such as adsorption onto organic particles, modulate the distribution of this metal. Recently, it has been proposed that the depletion of Cd from surface seawater is caused by its use by marine phytoplankton (4). Under conditions of Zn limitation, Cd enhances the growth rate of some marine phytoplankton in culture (4–6), and it thus seems that Cd may replace Zn in some essential biochemical function.\n\nIn Thalassiosira weissflogii, the enzyme carbonic anhydrase (CA) constitutes a major use of cellular Zn (7), and the expression of TWC
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The rigid cell wall of plants is made of fibrils of cellulose embedded in a matrix of several other kinds of polymers such as pectin and lignin. The cell wall is what gives them their firmness.  Other cells have soft walls.
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Water and "nutrients" depending on the specific type of cell. Plant cells need inorganic nitrogen compounds (ammonia, nitrate), phosphate, iron, magnesium, manganese, copper,...\nAnimal cells need organic substances like sugars or amino acids (which plant cells can produce on their own) additionally to vitamins and ions (iron, copper, cobalt, zinc, molybdenum, iodine, selenium,...)
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cell wall yes.  chloroplasts no.  cytoplasm in both   i am positive.
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No, the correct answer is A, but not all cells have a cell wall.  All bacteria and all plant and fungal cells have a cell wall in addition to a plasma membrane.  The cell wall is composed of different material in each of these groups; in bacteria it is often a substance called peptidoglycan.  Animal cells on the other hand have a plasma membrane but lack a cell wall.  This is a good thing for people infected with pathogenic bacteria.  The mechanism of action of many antibiotics involves destruction of the bacterial cell wall or interference with its formation, resulting in the death of the bacteria or prevention of their multiplication. There is no damage to the infected human's cells, since they do not have the cell wall.
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Square, with its cell wall?\n\nIt's been a while since undergrad basic biology:-)
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All cells have cell membranes.  They both have DNA and a lot of other stuff common to all life forms.  The main difference is that animal cells don't have cell walls but plant cells do.  If I were God, I would make animal bone cells have cell walls.  That would be cool.
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And some more stuff I've found on the net...\n\nThe cell wall is composed of several layers that are fabricated at different periods during cell differentiation (Fig. 2). The first layer to be developed after cell division is called the middle lamella, which is found between the wood cells, and ensures the adhesion of a cell with its neighbors. The middle lamella is only 0.5 to 1.5 µm thick and is made up of pectic substances to which lignin may be added during the differentiation period. At the beginning of cell differentiation, the primary cell wall forms. This new, highly elastic layer is attached to the middle lamella and is approximately 0.1 µm thick. The primary cell wall is made up of several layers of MFs, which are arranged randomly within this wall. Pectic substances, lignin, and hemicelluloses can be found between these MFs. As the developing cell reaches its definitive size, a new layer is formed inside the primary cell wall, which is the most important layer for the cell, in terms of mechanical strength. This new secondary cell wall is divided into three different layers, S1, S2, and S3 (Timell, 1986). Each of these layers is composed of cellulose MFs, aligned in an ordered, parallel arrangement, which differs from S layer to S layer. Hemicelluloses and lignin are also present in each of these layers. These three S layers can be modified during cell maturation, which lasts for several days after the birth of the wood cell, e.g. the amount of lignin and cellulose laid down in the secondary cell wall may be influenced by abiotic factors such as mechanical stress, i.e. wind and stem lean.\n\nYou can read the full article at: http://www.plantphysiol.org/cgi/content/full/127/4/1513
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Centrioles.\n\nNucleic acid.\n\nCell membrane is found in both animals and plants but cell wall is found only in plants. Cell wall is made up of cellulose (carbohydrates), while cell membrane is made up of lipids. Cell wall does not regulate the movement of substances in and out of it, but cell membrane does.
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There used to be a larger content of biomatter in sea water than there is currently, but it is safe to assume that a millilitre of sea water will contain organisms visible under the microscope. Chemically, this is the total organic carbon content of the water.\n\nThe main reason why there is so much life is the presence of great amounts of dissolved calcium hydrocarbonate, which will offer plants (algae) the matter to expand and which can be transformed by beast life.
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Kelp, algae, phytoplankton, seaweed
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a cell wall, it is only present in plant cells, animal cells only have a cell membrane.
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The non-living cell wall surrounds the living protoplast. Within the cell wall the cell membrane encloses the cytoplasm containing organelles (chloroplasts, mitochondria, nucleus, etc.) and a vacuole.\nThe vacuole contains many chemicals dissolved in water. Osmotic pressure within the vacuole squashes the cytoplasm against the cell wall when the cell is turgid to provide shape and support.\nThe two major compartments of the living part of a plant cell are the cytoplasm and the vacuole.