Question

Based on the DNA strand below, and assuming the promoter for this gene is located to the le\, which protein sequence below does this sequence code for? (Assume the first nucleoIde above is the start of the first codon.) 5’-ATGTTGAAAATGCCGTAGAGGC-3’

Answer 1

Protein sequence

Explanation:

• The given sequence is of coding strand(5'-3' direction)

5’-ATGTTGAAAATGCCGTAGAGGC-3’  

• Protein is made up of mRNA and mRNA has the same sequence as coding strand(only T is replaced by U) so the sequence of mRNA will be:

5’-AUGUUGAAAAUGCCGUAGAGGC-3’

According to the genetic code,3 bases code for one nucleotide and further nucleotide codes for amino acid,amino acids forms the base for protein

• AUG codes for Methionine(Met)
• UUG codes for Leucine(Leu)
• AAA codes for Lysine(Lys)
• AUG codes for Methionine(Met)
• CCG codes for Proline(Pro)
• UAG codes for stop codon(Stop)

Once the stop codon comes protein synthesis will be stopped,so the final protein sequence will be:

Met-Leu-Lys-Met-Pro-Stop