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MBch15
MBch15

... Organic synthesis and copying by DNA polymerase I. ...
Lecture20_Translation
Lecture20_Translation

... the Acceptor Stem on the Amino Acid Arm 3) The D Arm which contains dihydrouridine 4) 5 bp stem that contains the anticodon loop called the Anticodon Arm 5) 5 bp stem containing the sequence TΨC where Ψ is pseudouridine ...
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... Translation begins when an mRNA molecule in the cytoplasm attaches to a ribosome. As each codon of the mRNA moves through the ribosome, the proper amino acid is brought into the ribosome by tRNA. In the ribosome, the amino acid is transferred to the growing polypeptide chain [protein]. Each tRNA mol ...
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... Each tRNA carries a specific amino acid at one end  At the other end is a nucleotide triplet called an anticodon. This base pairs with the mRNA.  Made in nucleus, goes to cytoplasm  Can be used repeatedly  Short single strand of nucleotides ...
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... 18. VEGF is a molecule that is secreted into the blood by many human cancer cells and is a polymer of 154 amino acids. The peptide bonds of this molecule must have been made A. in the Golgi apparatus. B. on free ribosomes. C. outside of the cell. D. in or near the nucleolus. E. on the rough endoplas ...
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< 1 ... 62 63 64 65 66 67 68 69 70 ... 84 >

Transfer RNA



A transfer RNA (abbreviated tRNA and archaically referred to as sRNA, for soluble RNA) is an adaptor molecule composed of RNA, typically 76 to 90 nucleotides in length, that serves as the physical link between the mRNA and the amino acid sequence of proteins. It does this by carrying an amino acid to the protein synthetic machinery of a cell (ribosome) as directed by a three-nucleotide sequence (codon) in a messenger RNA (mRNA). As such, tRNAs are a necessary component of translation, the biological synthesis of new proteins according to the genetic code.The specific nucleotide sequence of an mRNA specifies which amino acids are incorporated into the protein product of the gene from which the mRNA is transcribed, and the role of tRNA is to specify which sequence from the genetic code corresponds to which amino acid. One end of the tRNA matches the genetic code in a three-nucleotide sequence called the anticodon. The anticodon forms three base pairs with a codon in mRNA during protein biosynthesis. The mRNA encodes a protein as a series of contiguous codons, each of which is recognized by a particular tRNA. On the other end of the tRNA is a covalent attachment to the amino acid that corresponds to the anticodon sequence. Each type of tRNA molecule can be attached to only one type of amino acid, so each organism has many types of tRNA (in fact, because the genetic code contains multiple codons that specify the same amino acid, there are several tRNA molecules bearing different anticodons which also carry the same amino acid).The covalent attachment to the tRNA 3’ end is catalyzed by enzymes called aminoacyl tRNA synthetases. During protein synthesis, tRNAs with attached amino acids are delivered to the ribosome by proteins called elongation factors (EF-Tu in bacteria, eEF-1 in eukaryotes), which aid in decoding the mRNA codon sequence. If the tRNA's anticodon matches the mRNA, another tRNA already bound to the ribosome transfers the growing polypeptide chain from its 3’ end to the amino acid attached to the 3’ end of the newly delivered tRNA, a reaction catalyzed by the ribosome.A large number of the individual nucleotides in a tRNA molecule may be chemically modified, often by methylation or deamidation. These unusual bases sometimes affect the tRNA's interaction with ribosomes and sometimes occur in the anticodon to alter base-pairing properties.
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