RNA Structure
The mRNA from which of the following would contain a poly-A tail?

Bacterial alpha-amylase
A restriction endonuclease from E. coli
Bacteriophage DNA ligase
Human insulin

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RNA Structure
The tertiary structure of yeast tRNA

involves extensive base stacking interactions
All of these
resembles the 3-dimensional structure of other tRNAs
is maintained mostly by non-Watson-Crick base pairing

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