A Key Modification in the 3' End of Eukaryotic MRNA

question 27

Multiple Choice

A key modification in the 3' end of eukaryotic mRNA is the addition of 50 to 250 adenine nucleotides, forming a poly(A) tail. Which of the following is NOT a function of the poly(A) tail?

• A) The stability of mRNA transcripts in the cytoplasm is affected by the poly(A) tail.
• B) The poly(A) tail facilitates the attachment of the ribosome to the mRNA.
• C) The poly(A) tail is important for proper nuclear export of the mRNA.
• D) The poly(A) tail at the 3' end translates to a long stretch of repeated amino acids.
• E) Multiple proteins will recognize and bind to the poly(A) tail in the cytoplasm.

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