RNA Carries the Information for Polypeptide Synthesis

Messenger RNA carries the message from the DNA for the synthesis of a polypeptide chain with a specific sequence of amino acids. Each protein is unique, resulting in an enormous variety of mRNAs. It should be noted (see table 28.1) that although 40%-50% of the RNA synthesized in E. coli 

The tertiary structure of yeast phenylalanine tRNA. (a) The full tertiary structure. Purines are shown as rectangular slabs, pyrimidines as square slabs, and hydrogen bonds as lines between slabs. (Source From G. J. Quigley and A. Rich, Structural domains of transfer RNA molecules, Science, 194 796, 1976.) (b) Nucleotide sequence. Residues 

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