usmle04
Forum Junior
Topics: 7
Posts: 23
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The following nunbered codons relate to partial sequence of mRNA for a protein. termination codons are UAg, UGA, UAA ; initiation codon AUG. The triplets are numbered as shown:
132 133 134 135 136 137 138 139
UUG CUG CCA UAU UGU UGU GUU AAU
Inerstion of uridine between end of codon 135 & beginning of 136 will result in a protein containing how many amino acids?
A) 134
B) 135
C) 136
D) 137
E) 138
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| Idiopathic
Forum Guru
Topics: 19
Posts: 641
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the answer should be 138. If you insert any nucleotide in the sequence, then you will come across a stop codon (UAA) at AA 139. THis will result in a 138-AA peptide.
remember, there are three stop codons: UAA, UAG, UGA
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| usmle prep
Forum Senior
Topics: 21
Posts: 100
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I agree with Idiopathic,ans is E)
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| usmle04
Forum Junior
Topics: 7
Posts: 23
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Thanks
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