6. Mutations occur randomly as the result of radiation, chemical toxicity, or er

Question

6. Mutations occur randomly as the result of radiation, chemical toxicity, or errors in o acid replication. How would a mutation in the DNA sequence alter the mRNA and amin sequences of this gene? Underline the section of DNA that differs between the original and mutation listed below. Write out both the mRNA and amino sequence (using the genetic code). Original DNA: mRNA: amino acids: TAC-ACA-GTA-CTT-CTT-TGA-CGA-GTA-ACT Mutant DNA: mRNA: amino acids: TAC-ACA-GTA-TAT-ACA-TTT-CTT-TTA--ACT 7. When in the cell cycle does protein synthesis take place?

Explanation / Answer

6) Original DNA: TAC-ACA-GTA-CTT-CTT-TGA-CGA-GTA-ACT

mRNA: AUG-UGU-CAU-GAA-GAA-ACU-GCU-CAU-UGA

Amino acids: Met-Cys-Leu-Glu-Glu-Thr-Ala-His-Stop

Mutant DNA: TAC-ACA-GTA-TAT-ACA-TTT-CTT-TTA--ACT

mRNA: AUG-UGU-CAU-AUA-UGU-AAA-GAA-AAU-UGA

Amino acids: Met-Cys-Leu-Ile-Cys-Lys-Glu-Asn-Stop

7) During interphase (particularly in G2 phase) of the cell cycle, protein synthesis takes place.

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