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DNA nucleotide

Discussion of all aspects of biological molecules, biochemical processes and laboratory procedures in the field.

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DNA nucleotide

Postby Diana Timpano » Wed Apr 27, 2005 2:46 am

I'm lost with this stuff.....Here are my questions. Thanks in advance.

1) A protein has the following amino acid sequence. Construct a DNA nucleotide sequence of the structural gene:

Phenylalanine-Glycine-Glycine-Alanine-Proline-Valine-Asparagine-Alanine


2) Are there 0 phosphates present in tRNA?
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Postby zami'87. » Wed Apr 27, 2005 7:28 am

1)look into the genetic code: if mRNA UU(U,C)-GG(U,C,A,G)-GG(U,C,A,G)-GC(U,C,A,G)-CC(U,C,A,G)-GU(U,C,A,G)-AA(U,C)-GC(U,C,A,G)
then DNA segment is AA(A,G)-CC(A,G,T,C)-CC(A,G,T,C)-CG(A,G,T,C)-GG(A,G,T,C)-CA(A,G,T,C)-TT(A,G)-CG(A,G,T,C).
just from mRNA to DNA use A becomes T, C becomes G, U becomes A, G becomes C.
2) Don't agree with you. Why? I mean tRNA also has "origin" from DNA like mRNA or rRNA

PS THIS GENETIC CODE IS FOR NUCLEUS DNA BUT NOT FOR MITOHONDRIAL DNA.Mitohondrial Gen cod is diffgerent in some cases.
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Postby thank.darwin » Wed Apr 27, 2005 7:04 pm

The DNA code could be;

AAA, CCT, CCT, CGT, GGT, TTA, CGT or
AAA, CCC, CCC, CGC, GGC, TTG, CGC or
AAA, CCA, CCA, CGA, GGA, TTG, CGA or
AAA, CCG, CCG, CGG, GGG, TTG, CGG or
AAC, CCT, CCT, CGT, GGT, TTA, CGT or
AAC, CCC, CCC, CGC, GGC, TTG, CGC or
AAC, CCA, CCA, CGA, GGA, TTG, CGA or
AAC, CCG, CCG, CGG, GGG, TTG, CGG ... I think you get the point :D
The list could go on...

Some Amino Acids have more than one triplet that will produce them... For example you could have CGA, CGC, CGG, CGT, AGA, or AGG and still get Arginine :D
No amount of experimentation can ever prove me right; a single experiment can prove me wrong.
-Albert Einstein
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Postby MrMistery » Wed Apr 27, 2005 7:57 pm

I agree with zami'87. on number 2. Every nucleic acid contains a phosphate(of course, not only one, it contains more)
"As a biologist, I firmly believe that when you're dead, you're dead. Except for what you live behind in history. That's the only afterlife" - J. Craig Venter
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