what is an organism that has negative and positive gravitropism?
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Any rooted plant does - you could pick an oak tree or a rose bush, or even a marijuana plant if you wanted.\n\nThe roots grow down, toward the center of gravity. The leaves and stem grow up, away from the center of gravity.
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Protozoa are generally motile, unicellular or syncytial, wall-less heterotrophic protists. They may be free living predators or scavengers, ingesting other organisms or bits of organic matter, or parasites or mutualistic symbionts. \n\nPhylum Rhizopoda : Amoebas Phylum Rhizopoda contains about 200 species. The Amoeba proteus, commonly called the Amoeba is one of the most thoroughly studied protists. This formless group of organisms use pseudopodia for movement and feeding. These organisms are found worldwide, in soil, in salt and fresh water, and in the bodies of animals. The species Entamoeba histolytica, can cause a serious disease in humans if it finds its way into the intestine. These organisms are usually naked, though some have a hard shell called a test. They do not contain cilia or flagella. They never undergo meiosis and do not produce mitotic spindles during cell division.  They are capable of changing direction indefinitely.
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Kingdom: Animalia \nPhylum: Nematoda \n\nCheck out the link below and look to the right side of the page.
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Slimemolds have these properties. They are a very strange fungus-like plant/animal.
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"A tropism is a biological phenomenon, indicating growth or turning movement of a biological organism, usually a plant, in response to an environmental stimulus. In tropisms, this response is dependent on the direction of the stimulus (as opposed to nastic movements which are non-directional responses). Viruses and other pathogens also affect what is called "host tropism" or "cell tropism" in which case tropism refers to the way in which different viruses/pathogens have evolved to preferentially target specific host species, or specific cell types within those species. The word tropism comes from the Greek trope ("to turn" or "to change"). Tropisms are usually named for the stimulus involved (for example, a phototropism is a reaction to light) and may be either positive (towards the stimulus) or negative (away from the stimulus).\n\nTropisms are typically associated with plants (although not necessarily restricted to them). Where an organism is capable of directed physical movement (motility), movement or activity in response to a specific stimulus is more likely to be regarded by behaviorists as a taxis (directional response) or a kinesis (non-directional response)."\nFrom Wikipedia, http://en.wikipedia.org/wiki/Tropism\n\nTropisms evolved over time in each species as a product of the evolutionary process of adaptation. The mechanism, i.e. "what causes tropisms", is encoded in the genes (DNA) of each species.\n\nHope this helps!
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Gram positive bacteria have a substance in their cell walls called peptidoglycan.  Gram negative bacteria have a less-complex cell wall with much less peptidoglycan.  Antibiotics such as penicillin interfere with the sysnthesis of peptidiglycan and prevent the formation of a cell wall.
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It is very simple. Last band gives you that answer. You need to see G=G bond and it is follow by TAG. It is definatly eukaryotic.
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An ameba. It is a single cell organism according to science book years ago. But I suspect the earlier answer as a virus is also correct.
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They are plant-like protists with two flagella to move. The move in a corkscrew like manner
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Gravity is a force of attraction here on earth that always pulls us toward the center of the planet.  Mass has a gravitational field.\n\nWhat I think that exterterrestrial life may have is some way of generating "anti" gravity such that the gravity here on earth would then repel an object.  It would be like having a "negative" mass.\n\nI think advanced propulsion systems would utilize such a drive, and who knows, some of these things that have been seen might just be the work of our government in secret.
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The euglena moves, which is something more commonly associated with animals. It has a flagellum. It also has an eyespot.
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Varied like any one cell organism. Amoeba are in this class. They process varied organic matter so they serve a recycling function. More info at the links given.
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Chemotrophs are organisms that obtain energy by the oxidation of electron donating molecules in their environments. These molecules can be organic (organotrophs) or inorganic (lithotrophs). The chemotroph designation is in contrast to phototrophs which utilize solar energy. Chemotrophs can be either autotrophic or heterotrophic.\n\nChemoautotrophs (or chemotrophic autotroph), in addition to deriving energy from chemical reactions, synthesize all necessary organic compounds from carbon dioxide. Chemoautotrophs generally only use inorganic energy sources. Most are bacteria or archaea that live in hostile environments such as deep sea vents and are the primary producers in such ecosystems. Scientists believe that the first organisms to inhabit Earth were chemoautotrophs that produced oxygen as a by-product and later evolved into both aerobic, animal-like organisms and photosynthetic, plant-like organisms. Chemoautotrophs generally fall into four groups: methanogens, halophiles, sulfur reducers, and thermoacidophiles. \nChemoheterotrophs (or chemotrophic heterotrophs) must ingest organic building blocks that they are incapable of creating on their own. Most chemoheterotrophs derive energy from organic molecules like glucose. \nThe names of these primary nutritional groups are built from Greek roots. "Chemo" means "chemical" and "troph" means "nourishment". "Auto" means "self" and "hetero" means "other".
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animal\nplant\nbacteria\nalgae\nmicro-organisms
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Completly false.  Plenty of organisms have flagellas.
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amoeba\nand i think cynobacteria \neuglena might be not, but im not sure
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An extention of the cell membrane which has the ability to move providing propulsion to the prokaryote