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The mRNA must contain the following to allow for initiation of protein synthesis in E. coli. a. A purine rich sequence to bind to the ribosome. b. A pyrimidine rich sequence to bind to the ribosome. c. A Shine-Delgarno sequence. d. A purine rich sequence to bind to the ribosome and a Shine-Delgarno sequence. e. A pyrimidine rich sequence to bind to the ribosome and a Shine-Delgarno sequence
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