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State the order of amino acids when the sequence of bases (nucleotides) in DNA is:

TACTGCTGCAGCCAGCCGACTAAATAG

2007-07-18 13:28:53 · 2 answers · asked by intoxicatedturtle 4 in Science & Mathematics Biology

2 answers

Here's the method. (Please note that the codons on the chart are mRNA codons, not tRNA codons. The two answers above mine must have transcribed DNA to mRNA and then they went one step too far and changed the mRNA to the tRNA anticodons. However, that's one step too many to read the amino acids off the chart. Trust me, the chart is for mRNA codons, not for tRNA anticodons.)

1. Transcribe DNA to mRNA. Match C with G. For DNA's A, use U instead of T because RNA has no thymine. For DNA's T, match an RNA A as usual.
DNA --> RNA
C --> G
G --> C
A--> U
T --> A

So the mRNA sequence from the DNA you listed is:
AUG ACG ACG UCG GUC GGC UGA UUU AUC

2. Use a chart that tells which mRNA codons call for certain amino acids. Look these up one codon (three bases) at a time. http://brv.k12.in.us/High%20School/Departments/Science/Adamczyk/Biology%20Files/Universal%20RNA%20Codon%20Chart.mht

AUG - methionine
ACG - threonine
ACG - threonine
UCG - serine
GUC - valine
GGC - glycine
UGA - STOP
UUU (It doesn't matter what the rest are after the STOP.)
AUC

2007-07-18 14:20:12 · answer #1 · answered by ecolink 7 · 0 0

Tyrosine, Cysteine, Cysteine, Serine, Glutamine, Proline, Threonine, Lysine, stop codon

2007-07-18 13:39:08 · answer #2 · answered by Brant 7 · 0 0

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