How many different types of tRNA molecules are necessary to produce a specified polypeptide chain?
826034
One tRNA is needed for each tri-nucleotide in the RNA that is being transcribed, so in theory 64 would be needed to ensure any RNA could be translated. However there is some bias in codon usage (some tri-nucleotides are not found in certain species) so in practice you would need slightly less than this. Of course if the protein being translated did not contain all 20 amino acids less would also be required then
1169213
codons  are molecules  that are part of messenger  rna  that represent a part of a protein to be synthesized.\nthe anticodon is part of the ribosome  that fits with the codon like 2 pieces of a jigsaw puzzle would fit and it will result in the attachement of a particular amino acid\nthus fro attaching different amino acid sequences different proeins are made for different dna sequences.
844548
http://www.reference.com/browse/crystal/23235\nhttp://www.reference.com/search?q=nucleic%20acids
883039
No, I don't really think so. Everything you said is basically true, but digestion occurs and in digestion your body will only take in which specific amino acids it needs at that point in time (we have no real way to store amino acids) and excete everything else.  So if you eat a lot of tryptophan your body will just stop taking it in when it doesn't need any more. \nAlso, your body can switch a lot of amino acids into a different amino acid. So if you have a lot of one and need more of another, your body can just make that one.\nNote that there are some "essential" amino acids, meaning that your body cannot make them and they must be ingested!\nAlso, maybe there's a bit of confusion on the codon thing. A codon is a specific sequence in the mRNA of 3 nucleotides that codes for an amino acid. A tRNA with the complementary anticodon will bring this amino acid to the growing chain. Only the tRNA that matches the codon will come in. This cannot be influenced by what you eat.
690667
The DNA will produce a messenger RNA which has nucleic acid sequences that correspond to the DNA it is produces from- so the mRNA is essentially a copy of a small part of the DNA..that's why it's called a messenger RNA- This mRNA goes into the cytoplams now.  Here, the three-base codons on the mRNA correspond to binding sites for the tranfer RNAs (tRNA).  These molecules bind, on one end, a specific amino acid-and on the other end, a specific three-base codon.  The tRNA is made of nucleic acids, just as the DNA is.  Therefore, the specific shape of the DNA codon will determine which tRNA will bind to it- and since the tRNA carry on their other end the amino acid that is added to the peptide, it will control what amino acid goes there.  I suspect, however, that they didnt mean to ask about the "shape" of the DNA, but rather about the base sequence.  It comes down to the same thing, though not as complex- Each three base codon on DNA eventually corresponds to a specific amino acid (the process described above) that is put onto a growing protein in the order that is specified by the DNA.  That's why it's called a code-three specific bases (a codon) will translate to one specific amino acid.
998721
9\n\n3 bases for each amino acid (applies to both DNA and RNA).
280916
t-RNA or transfer RNA consists of short RNA coupled to specific amino acids.  mRNA is translated into protein in ribozomes, via pairing with tRNA.  The pairing takes the form of a three letter code called a codon.  The pairing bases occur on the tRNA in the stem-loop structure.  The pairing is complementary, A with U, C with G.  However, the third position of the anti-codon on the tRNA is called the wobble position because an unusual nucleotide, inosine, can be found in some tRNAs.  This nucleotide can bind to A, U, or C. This leads to a single tRNA with a single amino acid being able to recognize and bind different codons.  Evolutionarily, it means that mutations in the coding sequence of DNA will not necessarily cause a change in the protein, depending on if the mutation is a point mutation of a wobble position.
1145562
http://www.fhcrc.org/science/shared_resources/proteomics/peptide_synthesis/basics/spps.html\nTry this one. I hope it helps
844734
mRNA transcripts carry the genetic information of specific genes to the ribosomes where they are translated into polypeptide sequences which later become proteins.
564143
Streptomycin is a broad spectrum drug. Unlike the other two drugs, mentioned, it does not block the A site aminoacyl - tRNA for peptidyl transfer reaction  in translation. This is the main step in protein formation.
505328
Transformation\nNucleotides\nBase
872254
(m)\n\ntRNA - short-chain RNA molecules present in the cell (in at least 20 varieties, each variety capable of combining with a specific amino acid) that attach the correct amino acid to the protein chain that is being synthesized at the ribosome of the cell (according to directions coded in the mRNA)
182875
If a cell has a sequence of DNA that can be transcribed, that means it can be made into RNA. RNA is then translated into proteins for the cell to use. Every 3 RNA nucleotides codes for an amino acid which are used to build proteins. The proteins are built in the cell's ribosomes using messenger RNA and transfer RNA; both of which were transcribed from the original DNA sequence.\n\nSo the cell that has a sequence of DNA that can be transcribed has the ability to make protein structures for whatever it needs; enzymes or physical structure.
1121385
The answer is A, translation.\n\n\nDuring translation, the messenger RNA copies information from DNA to produce proteins. The information gets read by  ribosomes which facilitate the production of proteins.
960830
Proteins, amino acids.
889203
Well this is a good question.\nIt depends on how much expenses you can afford and what are the technical expertise available with you\nAny ways here I offer you a few tips which you could think on.\n\nI will suggest you to use thermocol or a trasperant material for building up your ribosome model.\n\nAs its structure is very simple, cut two pices of thermocol as small and large subunits and paint them with two different \n\ncolours. Here you can use a combinations of model. Use this first one as a intact one to demonstrate just the shape of it. \n\nNow you can cut the thermocol in two different peices and show them as two subunits and explain it very briefly.\n\nHaving done so you can now expalin the intrinsic appearance and structure.You can show A, P and E sites which are L shaped and its easy to make. Becasue you can cut and carve the thermocol as you wish.\n\nIn the next model you can show the translation process. Use a wire as mRNA and show how it binds to above three \n\nmentyiones sites and show the amino acids coming out as small plastic beads coated to the wire.\n\nTo make your model more impressive, use a sheet of paper and display on your stall or board. This will help you for a better \n\ncommunication. Use this sheet for explaination of model. You can draw figures on this sheet and correlate the information with \n\nyour hand made model. This should go well.\n\n\nAlso add information of mRNA and riboseme, difference of prokaryotic and eucaryitic ribosome as a samll table. Arrange all the \n\ninformation carefully on the sheet and explain it as well.\nYou may find it exhaustive but I assure you this will get you good applauses.\n\nBye \n\nRavi
308194
Genotype is encoded by gene in DNA. Gene in DNA will be transcripted into mRNA. Then mRNA will be translated into polypeptide(protien). (Ribosomes play important role in transaltion.) So bacteria with different genotypes will have different protein --> different phenotypes.