Nucleic acids are composed of: O A. A phosphate group, a pentose sugar, a carboxylic acid
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O B. A pentose sugar, a nitrogen base, an R group
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O C. A nitrogen base, an amino group, a carboxylic acid
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O D. A phosphate group, a pentose sugar, a nitrogen base

One function of the poly-a tail on eukaryotic mrna sequences is to the mrna be transported from the nucleus to the cytoplasm. prokaryotic mrna also has a poly-a tail. choose the best explanation of the prokaryotic poly-a tail. a. prokaryotic poly-a tails are composed of a different molecular structure compared with eukaryotic poly-a tails. b. prokaryotic poly-a tails have the same functions as eukaryotic poly-a tails, because this process is highly conserved throughout different species. c. prokaryotic poly-a tails aren't important, because prokaryotes don't have nuclei. d. prokaryotic poly-a tails have other functions,because prokaryotes don't have nuclei.