Is this right? Anticodons?

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bearcub
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Is this right? Anticodons?

Post by bearcub » Tue Apr 14, 2009 11:03 pm

The anticodons of tRNA molecules are given below:

AGC UUC

Give the sequence of bases found along the corresponding section of the coding DNA strand.

UCG AAG

Is this right? Many thanks.

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Re: Is this right? Anticodons?

Post by menu » Wed Apr 15, 2009 5:41 am

the sequence of the coding DNA would be:

TCG AAG

because DNA has T instead of U

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Post by Darby » Fri Apr 17, 2009 8:50 pm

If it's tRNA, it connects to mRNA which was made from the DNA, so you're leaving out a step.

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Post by MrMistery » Sat Apr 18, 2009 9:34 pm

no, menu is correct - coding DNA strand has the same sequences as mRNA only with t instead of u
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Post by Darby » Sun Apr 19, 2009 3:59 am

I don't think so, since tRNA is the third step -

tRNA ACG would attach to mRNA UGC which would have come from DNA ACG.

tRNA UUC would attach to mRNA AAG which would have come from DNA TTC.

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Re: Is this right? Anticodons?

Post by menu » Sun Apr 19, 2009 5:02 am

Darby, what you have said is right, but that is not what bearcub is asking.
The DNA codes for the tRNA and the mRNA, therefore you can find the DNA sequence that coded for the tRNA directly from that by finding the corresponding code (including T).
however what you have done is found the DNA sequence that coded for the mRNA which will be different from what coded for the tRNA

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Post by MrMistery » Wed Apr 22, 2009 1:42 pm

also, darby, you have it wrong.

tRNA ACG would attach to mRNA UGC. UGC comes from DNA ACG TEMPLATE STRAND. The coding strand=nontemplate strand for mRNA UGC is TGC.
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Post by Darby » Thu Apr 23, 2009 8:16 pm

Sorry, you're right, not used to this particular terminology. Like a lot of things in DNA (exons, anyone-?), it's pretty counter-intuitive.

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