November 17, 2010

USMLE 1 Question 21

Three types of RNA involved in comprising the structural and functional core for protein synthesis, serving as a template for translation, and transporting amino acid, respectively, are:

a) mRNA, tRNA, rRNA
b) rRNA, tRNA, mRNA
c) tRNA, mRNA, rRNA
d) tRNA, rRNA, mRNA
e) rRNA, mRNA ,tRNA








ANSWER
The correct answer is E



Explanation

rRNA's serve a structural and functional role in protein synthesis as a component of the ribosome. The transpeptidization reaction has been shown to be caused by rRNA.

mRNA is transcribed from DNA to be used as a template for protein synthesis. The tRNA's bring the correct amino acid into the protein synthesis process.

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