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laila046 laila046
wrote...
Posts: 22
Rep: 0 0
10 years ago
A gene has four exons with lengths in base pairs (bp) as follows.

Exon 1, transcription start to just before ATG translation initiation codon:        219 bp

Exon 1, from ATG initiation codon to end of segment:                                        282 bp

Exon 2, all:                                                                                                                201 bp

Exon 3, all:                                                                                                                   93 bp

Exon 4, beginning through (and including) TGA stop codon:                              177 bp

Exon 4, from just after TGA stop codon to polyadenylation site:                        405 bp
 

How many amino acids does the protein contain?

   750 amino acids
   251 amino acids
   323 amino acids
   459 amino acids
   386 amino acids
   753 amino acids
   250 amino acids
   1158 amino acids
   972 amino acids
   1377 amino acids
   969 amino acids
   324 amino acids
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wrote...
10 years ago
Transcription start to ATG codon does not get translated into a protein, so that part doesn't matter. From ATG to end of segment does. All of exon 2 and 3 are translated, and exon 4 throughout the codon before the stop codon (since the stop codon codes for a release factor instead of an amino acid).

So you need to add 282 + 201 + 93 + 174 (177 - 3 for the stop codon) = 750 base pairs

There are 3 nucleotides for each amino acid, so 750/3 = 250 amino acids.
Zbrutha
laila046 Author
wrote...
10 years ago
thanks!
wrote...
10 years ago
Thank you
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