Which Is True About Proofreading Activity During the Synthesis of Aminoacyl-TRNAs

question 82

Multiple Choice

Which is true about proofreading activity during the synthesis of aminoacyl-tRNAs?

• A)Proofreading is accomplished as an amino acid enters the active site of the enzyme.Incorrect amino acids are rejected before any reaction occurs.
• B)Proofreading occurs just after aminoacyl-adenylate formation.
• C)A separate cytosolic proofreading enzyme catalyzes the hydrolysis of incorrect aminoacyl-tRNAs.
• D)No proofreading activity is necessary due to the high level of specificity of all aminoacyl-tRNA synthetases.

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