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Thatsme
 3 years ago
What peptide would you expect to result from a 21nucleotidelong DNA sequence that contains only the base adenine?
Thatsme
 3 years ago
What peptide would you expect to result from a 21nucleotidelong DNA sequence that contains only the base adenine?

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Thatsme
 3 years ago
Best ResponseYou've already chosen the best response.0a peptide composed of 7 phe a peptide composed of 21 phe a peptide composed of 7 lys or a peptide composed of 21 lys?

ebaxter01
 3 years ago
Best ResponseYou've already chosen the best response.0To answer this question look up the genetic code  ie which codons represent which amnio acids. Then figure out how many amino acids there are per codon (a codon is three nucleotides of course). To help I've included a link to the correct chart: http://en.wikipedia.org/wiki/Genetic_code You should look where it says "RNA codon table"

Thatsme
 3 years ago
Best ResponseYou've already chosen the best response.0Id appreciate it if you'd actually talk me through the answer than give me a link to wikipedia and tell me to look it up...

agreene
 3 years ago
Best ResponseYou've already chosen the best response.0So, remember that AT bonding occurs, thus when the DNA is transcribed to mRNA it will code to AU thus you will have a 21Uracil long dodecamer mRNA. If we look up with the codon UUU codes for, we will find it codes for Phenylalanine. Since the amino acids code based off then mRNA codons: 21/3 = 7 so we will have: A. a peptide composed of 7 phe hope that helps.

ebaxter01
 3 years ago
Best ResponseYou've already chosen the best response.0Hi, sorry if you didn't get the hang of this question from my initial answer. agreene has brought up base pairing and indeed this is the case. However the DNA sequence on the coding strand looks like the mRNA sequence. This is getting to be a contentious problem, possibly because the initial question wasn't clear about whether the polydA strand was coding or not. If not then we have polyU transcribed and polyphenylalanine results. If the DNA was the other way round then 7 lysines would be translated.
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