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Standard XII
Biology
Question

Open reading frame (ORF) starts with
  1. AUC
  2. GUC
  3. AUG
  4. UAC

A
AUG
B
AUC
C
UAC
D
GUC
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Solution
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A reading frame that lack termination codon among 50 or more codons is known as open reading frame. it has "AUG" triplet as start codon. The codon "AUG" codes for methionine and serves as start codon in eukaryotic reading frames. Since, AUG encodes single amino acid, it confers advantage of specificity as start codon. The triplet "UAC" codes for tyrosine; AUC codes for isoleucine and GUC as valine. Correct answer is A.

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