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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Definitions:

Successful Collisions

Interactions between reactant particles that result in a chemical reaction, dependent on factors like orientation and energy.

Cooled

The process of lowering temperature or the state of being less warm.

Molecules

Molecules are two or more atoms bonded together, forming the smallest fundamental units of a chemical compound that can take part in a chemical reaction.

Biochemical Reactions

Chemical processes that occur within living organisms to support life, including metabolism, respiration, and photosynthesis.