Table 82
Codons in MRNA Molecule and Their Corresponding Amino Acids

question 15

Multiple Choice

Table 8.2
Codons in mRNA molecule and their corresponding amino acids
$$\begin{array} { | c | c | c | c | } \hline \text { UUU } & \text { Phenylalanine } & \text { UAU } & \text { tyrosine } \\\hline \text { UUA } & \text { leucine } & \text { UAA } & \text { nonsense } \\\hline \text { GCA } & \text { alanine } & \text { AAU } & \text { asparagine } \\\hline \text { AAG } & \text { lysine } & \text { UGC } & \text { cysteine } \\\hline \text { GUU } & \text { valine } & \text { UCG, UCU } & \text { serine } \\\hline\end{array}$$




-Refer to Table 8.2.When amino acid sequences from a cell cycle control protein from a patient with cancer and a healthy person are aligned,the sequence from the cancer patient indicates one amino acid has changed from phenylalanine (Phe) to leucine (Leu) .A mutation in the cancer patient's DNA must have taken place.Identify the result of this DNA change in the mRNA codon that led to this change in the protein sequence.

• A)UUU altered to UCU
• B)UUU altered to UAU
• C)UCU altered to UUA
• D)CAA altered to UUU
• E)UUU altered to UUA

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