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dna transcription Flashcards

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4714604862transcription producescodons0
4714606679what is the purpose of dna transcriptionto go from the language of Nucleic Acids (base pairs) to the language of polypeptides (Amino Acids)1
4714609149number of codon combinations642
4714609155number of Amino Acids203
4714609725codona triplet base that specifies what Amino Acid is needed4
4714611175start codon that makes the AAcid- *methianine*5
4714612672stop codons-3 of them -they dont code for any AA's -indicates the *end of gene translation*6
4714621140where does transcription occurin the nucleus7
4714621600where does translation occurin the cytoplasm8
4714622476What are the 3 steps of transcription?1.Initiation 2.Elongation 3.Termination9
4714622850Transcription Initiation-Rna Polymerase attaches to the *promotor*; an area on dna that marks the start10
4714625040promotor-Tells *Rna Polymerase* where to start gene transcription -occurs during *initiation* phase11
4714626814Transcription Elongation-second step in transcription -this is when the new RNA strand is created12
4714628144Transcription Termination-third step in transcription -terminator is where polymerase ends -Causes the RNA Polymerase to break off. -now, it is ready to move to the cytoplasm and make proteins13
4714673195what mods need to be done to RNA after transcription?1.add caps and tails (once added, its called mRNA) 2.introns (interrupt codons)are removed from MRna14
4714679628Caps-they attach to the 5' end -15
4725432134Once a cap and tail is added, it'smRNA16
4725432135tRNA is foindIn the cytoplasm17
4725432136tRNA createsNew sequences from codons18
4725432137Anticodon of tRNA willRead the mRNA19
4725432138What are the tRNA binding sitesA site, P site, and E site on the ribosome20
4724115150Tail-3' end -50 to 250 Adenines in a row21
4724126274introns-interrupt codons -not expressed and are removed at end of transcription phase22
4724129018tRNA-found in the cytoplasm -takes codons and makes a new sequence --free amino acids are also in cytoplasm codes for specific amino acid one one end. -the other end has an anticodon. This will read the mRNA -binds to large subunit23
4724134859anticodon-one end of tRNA that reads mRNA24
4724159323mRNA-binds to small subunit of ribosome -25
4724164093Initiation of polypeptide synthesisthe mRNA, the tRNA, and the large and small subunits combine26
4724179417elongation of polypeptide synthesistRNA's keep moving along and adding to the polypeptide chain (at their amino acid attachment site). the mrna is moved through the ribosome one codon at a time27
4724232974termination of polypeptide synthesisthe end result is that we are getting a phenotype from a genotype28
4724281236what is the end result of this process?the end result gives us a phenotype from a genotype!29
4724956273types of mutations*silent*-doesent change phenotype *missense*-changes an amino acid to another *nonsense*-changes amino acid to a stop codon (UAA, UAG, UGA) *frameshift*-inserts or deletes nucleotides30
4724959646silent mutationthe phenotype doesent change, but the AA genotype does31
4724960150missenseone amino acid is changed to another32
4724960741non sensean amino acid is changed to a stop codon (UAA, UGA, UAG)33
4724961240Frameshiftinserts or deletes nucleotides like a timeshift in back to the future34
4725179309AUGthe start codon *methianine*35
4725179310UAAa stop codon36
4725179599UGAa stop codon37
4725179975UAGa stop codon38

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