mrna sequence question with picture attached

Chemistry
Tutor: None Selected Time limit: 1 Day

What is the mRNA sequence for the following segment of DNA?
--CTCGTGGTTTCAACC-- (10 points)
Based upon the mRNA sequence, what is the peptide sequence (10 points)?
Oct 22nd, 2015

Thank you for the opportunity to help you with your question!

1. First, it's good to know which bases pair with each other. C will pair with G and vice versa. T will pair with A. A doesn't pair with T in mRNA however, because T is replaced with U. So in this example the pairing will be:

CTCGTGGTTTCAACC (DNA)

GAGCACCAAAGUUGG(mRNA)

Now that you have the mRNA sequence you can find the peptide sequence. Peptides are encoded by 3 nucleotides or codon. So if you break the mRNA sequence up into groups of 3 you get:

GAG CAC CAA AGU UGG

Each of these corresponds to a peptide. Usually you can find which sequence corresponds to each peptide on a chart online. Using a chart like that it can be found that the peptide sequence is:

Glutamic Acid, Histidine, Glutamine, Serine, Tryptophan

Please let me know if you need any clarification. I'm always happy to answer your questions.
Oct 22nd, 2015

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