Kathryn D.

asked • 12/04/12

DNA to mRNA for three diferent strands of DNA, given "5-AGT-3"

My Study Group can't figure out this problem:

"A triplet of bases in the Template Strand of DNA = 5'-AGT-3', The corresponding codon found in the mRNA would be..."

but then they ask the same question for the Non-Coding and Coding strands of DNA for the same "DNA = 5'-AGT-3'". Can you please explain what is different, why they are different, and what the three answers are?

1 Expert Answer

By:

Michael M. answered • 12/04/12

Biology, chemistry, math, and test prep tutor

Emma D.

tutor

Hi Kathryn, 

Here is how mRNA is created: coding DNA gets transcribed to template DNA, then template DNA gets transcribed to mRNA.  

It is important to remember that 5' ends get "transcribed" to 3' ends.  So the template DNA 5'AGT3' is transcribed to the mRNA 3'UCA5'.  But since it is customary to write codons from 5'-end to 3'-end, the mRNA codon is actually ACU.

coding DNA:      5' ACT 3'

template DNA:   3' TGA 5'

mRNA:              5' ACU 3'

Hope this helps!

Report

12/05/12

Michael M.

Whoops, thinking fail, this is what I get for doing these in the wee hours, Emma is quite right.

Report

12/05/12

Still looking for help? Get the right answer, fast.

Ask a question for free

Get a free answer to a quick problem.
Most questions answered within 4 hours.

OR

Find an Online Tutor Now

Choose an expert and meet online. No packages or subscriptions, pay only for the time you need.