- The DNA sequence shown is ATGATCTCGTAA.
- During transcription, this DNA sequence is used as a template to synthesize a complementary mRNA strand. In RNA, thymine (T) is replaced by uracil (U). The mRNA transcript is therefore AUGAUCUCGUAA.
- During translation, the mRNA sequence is read in groups of three nucleotides called codons.
- The first codon, AUG, codes for the amino acid Methionine (Met), which also serves as the start signal.
- The second codon, AUC, codes for Isoleucine (Ile).
- The third codon, UCG, codes for Serine (Ser).
- The fourth codon, UAA, is a stop codon and does not code for any amino acid; it signals termination of translation.
- Therefore, the resulting polypeptide chain consists of the amino acids Met-Ile-Ser.
Parent Tip: Review the logic above to help your child master the concept of transcription worksheet biology.
