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julie7 julie7
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11 years ago
If a strand of DNA had the following sequence of base triplets, what is the corresponding sequence of codons on the strand of mRNA that was transcribed from it?
DNA sequence: TAC GCG AAC TCG

What is the sequence of tRNA anticodons that would pair up with the sequence of codons from the previous question?
From that sequence of tRNA anticodons, what is the sequence of amino acids that would be synthesized?
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wrote...
11 years ago
1- mRNA                  = AUG CGC UUG AGC

2- tRNA anticodons = UAC GCG AAC UCG

3- amino acids         =  Tyr    Ala    Asn Ser
wrote...
11 years ago
Well, this question is impossible to answer without knowing what the orientation of the DNA Strand is (3'->5' or 5'->3') however we can assume that it is 3'->5' since the mRNA is transcribed form this. Now remember that the mRNA is in the orientation 5'->3' and that in RNA T bases are replaced with U (standing for uracil). The mRNA is then 5'AUG CGC UUG AGC3'. The anticodons are carried by tRNA which is in the opposite orientation (3'->5'). Thus 3'UAC GCG AAC UCG5' is the anticodon sequence. Remember that the amino acids correspond to the mRNA strand. Each 3 letter codon represents one amino acid. You must use a chart to decipher the code. Use a chart similar to this: http://www.google.com/imgres?imgurl=http://www.tritechresearch.com/aachart.gif&imgrefurl=http://www.tritechresearch.com/const.shtml&usg=__qppoB4fMsFIL5xvvN0NKmBwUXxY=&h=262&w=364&sz=15&hl=en&start=0&zoom=1&tbnid=Pc1OM7n7Mxb4EM:&tbnh=149&tbnw=207&ei=yPeITdnoG6y_0QGOo8S8Dg&prev=/images%3Fq%3Damino%2Bacid%2Bchart%26um%3D1%26hl%3Den%26safe%3Doff%26sa%3DN%26rlz%3D1R2ADSA_enUS401%26biw%3D1259%26bih%3D822%26tbs%3Disch:1&um=1&itbs=1&iact=rc&dur=188&oei=yPeITdnoG6y_0QGOo8S8Dg&page=1&ndsp=24&ved=1t:429,r:2,s:0&tx=135&ty=90
The sequence is Met (Start Codon) Arg Leu Ser

Hanoofa is incorrect! They have transcribed the wrong amino acids! It is incorrect.
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