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The poly adenine tail is used to provide a fuse. This is because RNase enzymes cleave off a section of the nucleotides at the end of the mRNA strand. The destruction of the mRNA is to prevent it persisting within the cell after being used, the length of the tail shows how many times it will be used before being degraded.

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Q: What is the significance of a polytail consisting of AAA at the end of a mRNA sequence?
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