what is the function of amphicytes?
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Supporting cell that surround neurons in the peripheral nervous system.
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Check for the optimum texture and pH for the grass.\n\n\nFor the amoeba,i guess it is contractile vacuole.
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True. water is essential for the transport of nutrients within them, since it is the "universal solvent".
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mostly phospholipids (the bulk of the membrane is the phospholipid bilayer, with hydrophobic tails pointed towards each other and hydrophilic heads pointing out), with a bunch of proteins stuck in it like little potatoes :) \n\nmixed in the sea of phospholipids are small amounts of cholesterol (roughly the same size) to help prevent weakening of the cell membrane at high temperatures.\n\nAs for proteins, there are many types with many functions!\n- transport proteins\n- identity markers\n- junctioning proteins (stick to other cells)\n- anchors for cytoskeleton\n- enzymes\n- hormone receivers
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The function is as a power source. Energy in the\nform of chemicals with highly active electrons are\nstored in the mitochondria. Here is an excellent site.\ncellbio.utmb.edu/cellbio/\nmitochondria_1.htm#\npowerhouses\n A fascinating little tidbit is that it is the only\nplace outside the nucleus that contains DNA. Thus its\nname, mitochondrial DNA and it's only passed down\ngenetically thru the mother.
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All cells have membrane-spanning proteins that serve as channels.  They can move materials across the cell membrane, either in or out, by passive diffusion, active transport (ie ATP-consuming energy-burning motors that sort materials against a chemical gradient) or facilitated transport (ie coupled transport systems where the movement of one chemical down a chemical gradient is coupled with the transport of another chemical up a gradient).  Some combination of these methods is used to transport wastes from the bacterial cell.\n\nIn eukaryotic cells (ie not bacteria, but possibly including single-celled protists and fungi) there can also be excretion of materials by the means of small vessicles made of the same lipid bilayer that the membrane is made of.  When these vessicles fuse to the cell membrane, the contents spill out, and the vessicle lipids become part of the cell membrane.
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the paramecium gets rid of excess water through the contractile vacuole.  this regulates the amount of water in the body of the paramecium. \n\nSince the regulation of the amounts of water and minerals in the body is included under the term homeostasis, the contractile vacuole is said to help maintain homeostasis.
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Limbs are paddle-shaped to help the turtle move through the water; excretion of salts through lacrymal gland -conversion of saltwater to freshwater keeps the internal organs from failing and protects the sea turtle from dehydration; hard outer shell protects the turtle from predators and helps prevent dessication (drying out); hinge in the body that allows the turtle to take in more air and come up to breathe less frequently
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Movement of substances across the cell membrane is the function of the 3 types of diffusion.\n\n\nThe generalized cell functions include movement of substances across the cell membrane, cell division to make new cells, and protein synthesis. \n\n\nMovement of substances across the cell membrane \nThe survival of the cell depends on maintaining the difference between extracellular and intracellular material. Mechanisms of movement across the cell membrane include simple diffusion, osmosis, filtration, active transport, endocytosis, and exocytosis. \n\nSimple diffusion is the movement of particles (solutes) from a region of higher solute concentration to a region of lower solute concentration. Osmosis is the diffusion of solvent or water molecules through a selectively permeable membrane. Filtration utilizes pressure to push substances through a membrane. Active transport moves substances against a concentration gradient from a region of lower concentration to a region of higher concentration. It requires a carrier molecule and uses energy. Endocytosis refers to the formation of vesicles to transfer particles and droplets from outside to inside the cell. Secretory vesicles are moved from the inside to the outside of the cell by exocytosis.
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First of all, when dealing with biology, you should never BELIEVE that there is a PURPOSE for anything. This sort of thinking evokes the notion that this structure was disigned to do something. Biological structures evolve into their present form because that form is more fit than any of the alternative forms that came before.\n\nAs for the outer ear (the visable portion that protrudes from the side of your head) the function they provide is as a condensor to collect and concentrate energy waves that are able to be decifered by our inner ear and brain as sound.
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Yes proteins are amphoteric, they do contain both acidic and basic residues, but the charge on the protein is dependent on the degree of dissociation of the acidic or basic groups. \n\nThe Tris-HCl buffer used in gel electrophoresis(assuming you are talking about PAGE, most commonly used for proteins) has a pH of 8.7. At this pH the protein molecules have a net negative charge, hence they move towards the positive electrode. Their difference in mass leads to their separation as does the amount o charge that they carry.\n\nIsoelectric focusing uses the amphoteric nature of proteins to the max - it uses the isoelectric point of the protein for its separation. The isoelectric point is the pH at which the protein has no charge and hence it stops moving in the electric field.
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water vascular system helps the echinoderms in circulating the food & waste materials.....moreover it helps in their locomotion....
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1) diffusion of gases in excretory system\n2) their gills pump H20 over one side and splits it up so oxygen flows over teh other to extract 02\n3) C02 diffuses out of cells
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the end of a cell. It is used for locomotion of the cell
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When water enters the cell..it must be regulated or the cell will...em...explode...these vacuoles help the paramecium to send out extra water...
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pumping ions across the cell membrane requires energy which is produced by glycosis, the Krebs cycle, and Phosphorilic oxidization.  This electron transfer process yeilds a lot of ATP which is used as energy.
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They have mouth openings often with flagellum to help with their filter feeding.  The tail end is thinner and is lighter in color/more transparent.  Just do an image search for amphioxus and see!