Refer to the genetic code to determine which of the following mRNAs could code for a protein containing the amino acid sequence Phe-Arg-Ala. I.5′-UUU CGU GCU-3′
II)5′-UUC CGG GCG-3′
III)5′-UUU AGA GCC-3′
A) All of these code for the given sequence.
B) I and II
C) I only
D) II only
E) II and III

Question

Quizplus · Accepted Answer

Each of the mRNA sequences provided translates to the amino acid sequence Phe-Arg-Ala, according to the genetic code. Sequence I (5′-UUU CGU GCU-3′) translates to Phe-Arg-Ala directly. Sequence II (5′-UUC CGG GCG-3′) also translates to Phe-Arg-Ala, considering that both UUU and UUC code for Phe, CGU and CGG for Arg, and GCU and GCG for Ala. Sequence III (5′-UUU AGA GCC-3′) translates to Phe-Arg-Ala as well, with UUU for Phe, AGA for Arg, and GCC for Ala.

Refer to the Genetic Code to Determine Which of the Following