what is the function of g-protein?
143877
G-protein is a shorthand term for guanine nucleotide binding protein.  Generally, these are proteins which can be turned on or off by binding to GTP (or guanine triphosphate).  These are often coupled to transmembrane proteins that will activate the g-protein in response to binding a ligand (so-called g-protein coupled receptors).  The use of these paris are to trigger a chemical cascade to initiate activity in a cell in response to an external stimuls.  When the ligand binds the g-protein coupled receptor, it makes the g-protein lose a molecule of GDP (guanine diphosphate) in favor of a molecule of GTP.  In that form it is active, and it will activate other molecules.  Eventually, it will hydrolyze the GTP into GDP + Pi (inorganic phosphate), and in that form its inactive again.\n\nThe structure is complicated.  Briefly, it has three subunits (alpha, beta and gamma) and I'm pretty sure that activation of the protein makes them dissociate.  It's complicated, and a long time ago, so I'd check the link for the structure.\n\nCheers.
555051
All mRNA signals are translated by ribosomes, usually on rough endoplasmic reticulum. Cytoplasmic proteins will then be released to the cytoplasm, secreated proteins will be packaged up into vesicles by the golgi apparatus, and membrane proteins will be moved to the membrane.\nHope this helps :)
921454
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.
263535
Chaperone proteins help newly made protein to fold into the appropriate secondary and tertiary structures (since primary structure is already created during translation, well there are some post tranlational modifications). It also prevents the protein from escaping into the cytoplasm, and prevents it from be degraded.
926065
Transport is a more general term.\nTransport proteins can be carriers or channels.\nCarriers bind the small molecule that is going to be transported and flip from one side of the membrane to the other. or change their shape so that the molecule binds while being on one side of the membrane and is released on the other.\nChannel proteins, as the name indicates, create tunnels in the membrane through which molecules can pass. The size of the opening and some additionals things make the channels specific to certain molecules. Also the channels can open and close according to the cell's needs.
93102
the functions are:\nmRNA: Carries information and goest to ribosomes\ntRNA: Goes to the cytoplassm and picks up the amino acids\nrRNA: Makes the ribosomes
330689
Signal transduction is an essential process where a signal molecule effects an effector, and this can initate a cascade of events that amplify or attenuate signals.  \n\nFor example, lets say a signal molecule (like a hormone) binds to a given receptor, this receptor may change conformation, which then effects other molecules (like a G protein).  The G protein can effect other effector molecules (like adenylyl cyclase) which can synthesize signal molecules (like cAMP).  So, there are a huge variety of signal transduction pathways, and a lot of Nobel Prizes have been awarded for research in the area.  But, the above is the basic idea.  \n\nAs for early brain development, the brain is obviously an extremely complex organ, and it is essential that neurons are able to make the proper synaptic connections with other cells.  In order to do this, however, signals must be created and transduced to give a sort of roadmap in how these synaptic connections are made.  An example might be the "nogo" protein, which is a signal molecule that tells a neuron to "no go," or to not go in the area of that signal molecule.  Again, lots of people are in this area of research, and this is only a cursory overview...but I hope this helps.
660691
Functions of the Pancreas \n\nThe pancreas has a dual role - it helps digest food and also secretes hormones that, among other things, affect the level of sugar in the blood.\n\nIt manufactures enzymes to aid in digestion and produces the hormone insulin to regulate blood sugar levels in the bloodstream. The digestive juices secreted by the pancreas combine with juices from the intestines to complete the job of breaking down proteins, carbohydrates, and fats. Substances in the pancreatic juice also help neutralize stomach acids that pass from the stomach into the small intestine.
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Alfred G. Gilman and Martin Rodbell was given the noble prize for their discovery of "G-proteins and the role of these proteins in signal transduction in cells".
752240
proteins-amino acids, nucleic acids-nucleotides, carbohydrates (sugars)-glucose, and lipids-gylcerol and fatty acids
566418
they are a protein that speed up chemical reactions.
1022598
Linker or adapter proteins provide mechanisms through which  effector proteins (which bind to other proteins and alter their activities) can be amplified and/or regulated.\n\nI think, anyway. Could be wrong.
1025834
Because it is involved in vasoconstriction, bronchoconstriction in the lung, and platelet aggregation. It is a short-lived hormone excreted in the kidneys.
81856
All answers are correct. The primary aminoacid sequence is changed which may have implications for the structure and funtion of the protein
254602
protein is albumin\n\namino acid is glycine
944822
The primary function of DNA in most organisms is protein synthesis. DNA holds the "blueprint" for every protein necessary to sustain life. \n\nThe combination of a certain gene's base pairs is transcribed into messenger RNA (or mRNA). That mRNA is then carried to the ribosome where, with the help of transfer RNA (or tRNA) amino acids are assembled in a particular order to form proteins. And proteins are essential in just about every step of the life functions of an organism. \n\nIt's these proteins that make your eyes blue, your hair brown or give you no hair at all. In fact, all genetic traits are expressed through proteins created using the DNA blueprint. People look different and have different characteristics due to variances in the types of proteins and combinations their genes code for.
568367
the endocrine system's main function is to maintain homeostasis. it does so mostly through chemical messengers called hormones. hormones are produced in one organ and used in another. the endocrine system uses many glands such as the pituitary gland, which is like the director of the endocrine system, the hypothalamus, which controls the pituitary gland, and the pineal gland, which controls growth and development and so on and so forth. there are also numerous other glands, like the thyroid gland, the and non-glands, like the pancreas, that secrete (another word for make) hormones, in the case of the pancreas, it secretes insulin and glycogen, which lower and increase the level of sugar in your blood. \n\n\nhope this helps you at all and you had better not copy  this word for word.