A Geneticist Is Performing an Experiment to Alter Protein Structures

question 92

Multiple Choice

A geneticist is performing an experiment to alter protein structures by incorporating modified amino acids into their polypeptide sequences.  During the process, she incubates dermal fibroblasts in a medium containing fluorescently labeled lysine residues.  After several hours, she finds that aminoacyl tRNA synthetase in the fibroblasts "loads" lysine residues onto tRNA molecules containing the anticodon UUU.  This residue most likely attaches to tRNA at which of the following sites in the image shown below?

• A)A
• B)B
• C)C
• D)D
• E)E

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