You Have Discovered an Alien Life-Form That Surprisingly Uses DNA

question 28

Multiple Choice

You have discovered an alien life-form that surprisingly uses DNA as its genetic material, makes RNA from DNA, and reads the information from RNA to make protein using ribosomes and tRNAs, which read triplet codons.Because it is your job to decipher the genetic code for this alien, you synthesize some artificial RNA molecules and examine the protein products produced from these RNA molecules in a cell-free translation system using purified alien tRNAs and ribosomes.You obtain the results shown in Table 7-48. $\begin{array}{c|c}\text { Message } & \text { Peptides produced } \\\hline \text { poly UA } & \text {... Tyr-Cys-Tyr-Cys ... } \\\hline \text { poly UC } & \text {... Phe-Lys-Phe-Lys .... }\\\text { poly UAC } & \ldots \text { lle-lle-lle-lle ... } \\& +\\&\text {... Ser-Ser-Ser-Ser... } \\&+ \\&\text {... Pro-Pro-Pro-Pro ... }\\\hline\text { poly UCA } & \text {... Ala-Ala-Ala-Ala ... } \\& +\\&\text { ... His-His-His-His...}\\&+\\&\text { ... Val-Val-Val-Val...}\\\hline\text { poly AUA } & \ldots \text { Arg-Arg-Arg-Arg ... } \\& +\\&\text { ... Glu-Glu-Glu-Glu... }\\&+\\&\text { ... Tyr-Tyr-Tyr-Tyr ... }\end{array}$ Table 7-48
From this information, which of the following peptides can be produced from poly UAUC?

• A)Ile-Phe-Val-Tyr
• B)Tyr-Ser-Phe-Ala
• C)Ile-Lys-His-Tyr
• D)Cys-Pro-Lys-Ala

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