A Geneticist Is Doing Research to Modify Protein Structures by Inserting

A geneticist is doing research to modify protein structures by inserting changed amino acids into polypeptide sequences. She incubates cutaneous fibroblasts in a medium containing fluorescently tagged lysine residues during the procedure. After many hours, she discovers that fibroblast aminoacyl tRNA synthetase "loads" lysine residues onto tRNA molecules carrying the anticodon UUU. In the figure below, which of the following residues is most likely attached to tRNA?

A) A
B) B
C) C
D) D
E) E
F) F

Correct Answer:

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