what is a fuction of mRna,tRNA,rRna?
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mRNA is the RNA that is transcribed from the DNA in the nucleus and is used as the template for translation.\ntRNA is the RNA that holds the polypeptide and is used in translation to connect the polypeptides in the correct order to make a protein.\nrRNA is the RNA that is in a ribosome. The different subunits of the ribosome are used like an assembly line for the mRNA and the tRNA to connect the polypeptides.
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once the DNA has been transcribed, spliced and modified, the new mRNA is moved out of the nucleus of the cell and into the cytoplasm.  There, a ribosome attaches to it.  The mRNA serves as a template for translation.\n\nHere's how that works.  mRNA is read in groups of 3 nucleotieds.  Each group of 3 is called a codon.  When the ribosome is attached to the mRNA, new amino acids that correspond to the codon can get added to the chain.\n\nEssentially, the ribosome moves like a train down the mRNA, stopping at each codon.  Every time it stops, a tRNA can enter and drop off an amino acid.  The tRNA has to be specific to that codon otherwise, it can't enter the ribosome.  The tRNA that is specific to a certain codon, is also specific to the amino acid it carries.  So indirectly, each codon corresponds to an amino acid.\n\nThe role that DNA plays is that it encodes for the mRNA and the mRNA encodes for the protein.\n\nThere's a lot of nuance that I didn't get to, like anticodons, reading frames, P sites, A sites, E sites, etc...If you care about these specifics, post another question ;p
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channel proteins, also called transport protiens\n\nBy the way, tRNA transports amino acids to ribosomes for protein synthesis, and is not protein  but RNA
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tRNA is for transcription.  During transcription tRNA delivers the correct amino acid to the groing polypeptide chain.  The tRNA reads the sequences in pairs of 3 called codons.  Each codon codes for an amino acid, some codons code  for the same amino acid.  During transcription the mRNA binds to the rRNA and tRNA (transription) binds and starts at the AUG start codon.
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rna is copy of the dna used in transcription (i think) then it's translated back into dna somewhere else in the cell
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You're going to have to be more specific.\n\nThere's mRNA, tRNA, and rRNA if you're answering questions from a biology textbook and are too lazy to learn the answer yourself.\n\nmRNA = messenger RNA\ntRNA = transcriptional RNA\nrRNA = ribosomal RNA\n\nThere's also miRNA and siRNA, which are genetic regulator molecules and could thus be considered not "true" RNA, but they're clearly labeled RNA.
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proteins\ncarbohydrates\nfats\nnucleic acids like dna and rna\nare the major biomolecules.
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Transcription is the process of creating an RNA copy of one's DNA or mRNA.  RNA polymerase is responsible for this process.  This process is very important because mRNA is then used in "translation" to form proteins by means of a Ribosome.  \n\nYou need a TATA box for transcription.  There are three types of RNA polymerase: types 1, 2 and 3.  Type 3 RNA Polymerase typically are the ones with the TATA boxes.\n\nTake a look at this website to watch how RNA polymerase synthesizes a new mRNA through transcription:\nhttp://www.phschool.com/science/biology_place/biocoach/transcription/complete.html\n\nHave fun!
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RNA is short hand for Ribonucleic Acid. RNA has a similar structural appearance to DNA (Deoxyribonucleic Acid). You can read about the chemical structure at the site referenced below.\n\nRNA crops up in several different cell locales from the nucleus to the ribosomes and appears to serve in a variety of cell roles. The basic function most often noted is that of a messenger or transfer template upon which proteins are built. The information for this construction comes from the DNA which unzips long enough for these RNA templates to be formed.\n\nThe less noted ribosomal RNA may well be more important in that the ribosomes are protein factories.  And protein manufacturing is kind of where it is at.  It just that text book writers have to draw the line somewhere on how much information about how many cell types is going to be discussed.  If we are talking the brain cells for instance there is some evidence to suggest RNA might well play a part in memory formation.  \n\nThis is seriously cooked down discussion of a key chemical player in cellular dance of life. If you take up where your book left off I suggest a visit to your local library. The subject area you want is biochemistry or molecular biology.  For the latest info your next step would be to hit the stacks in your local university library to review the science journals.  Citation index is big help here.
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nucleic acids. Deoxyribonucleicacids(DNA), ribonucleicacids (RNA), inside the nucleus it contain the chemical nucleic acids.
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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
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Transformation\nNucleotides\nBase
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mRNA is messenger RNA contain codon with 3 bases to carry message from DNA for what type of Amino acid needed.  It in transcription.\nthe translation is called gene expression.  it makes proteins by using RNAs and AA in the cytoplasm.
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threonine\n\nthere should be a table in your textbook with mRNA codons and corresponding AA's.
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Codons are found on the mRNA strand, and they are simply 3 consecutive bases that code for a particular amino acid. Anticodons are found on tRNA. \n\nLet's say the first codon in your mRNA sequence is AUG, the anticodon would be UAC. A tRNA with that anticodon will base pair with the mRNA on the ribosome at the region with the codon AUG, and it then goes into the cytoplasm to pick up the amino acid that is coded for by AUG (not UAC which the anticodon found on the tRNA itself!). the tRNA then brings the amino acid (in this case methionine) back to the ribosome where it is attached to more and more amino acids to yield the desired protein (the protein which the mRNA codes for).\n\nRemember, a protein is a chain of amino acids.\n\nThat's it in very simple terms.
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Messenger RNA (mRNA) is RNA that encodes and carries information from DNA during transcription to sites of protein synthesis to undergo translation in order to yield a gene product.\n\nTransfer RNA (abbreviated tRNA) is a small RNA chain (74-93 nucleotides) that transfers a specific amino acid to a growing polypeptide chain at the ribosomal site of protein synthesis during translation. It has sites for amino-acid attachment and codon (a particular sequence of 3 bases) recognition. The codon recognition is different for each tRNA and is determined by the anticodon region, which contains the complementary bases to the ones encountered on the mRNA.\n\nRibosomal RNA (rRNA) is the primary constituent of ribosomes. Ribosomes are the protein-manufacturing organelles of cells and exist in the cytoplasm. rRNA is transcribed from DNA, like all RNA. Ribosomal proteins are transported into the nucleus and assembled together with rRNA before being transported through the nuclear membrane. This type of RNA makes up the vast majority of RNA found in a typical cell. While proteins are also present in the ribosomes, solely rRNA is able to form peptides. Therefore ribosome often is referred to as ribozyme.
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Messenger RNA is RNA that carries information from DNA to the ribosome. Once mRNA has been transcribed from DNA, it is exported from the nucleus into the cytoplasm (in eukaryotes mRNA is "processed" before being exported), where it is bound to ribosomes and translated into protein.\n\nTransfer RNA is a small RNA chain that transfers a specific amino acid to a growing polypeptide chain at a ribosome site of protein synthesis. It has sites for amino-acid attachment.\n\nI hope this helps.