Question

select all that apply
choose all modifications of eukaryotic transcripts.
addition of a 3 poly - a tail
removal of introns
addition of introns
addition of a 5 cap
addition of a 3 cap
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Explanation:

• Addition of a 3' poly - A tail: In eukaryotes, after transcription, a poly - A tail (a series of adenine nucleotides) is added to the 3' end of the mRNA. This helps in mRNA stability, export from the nucleus, and translation initiation.
• Removal of introns: Eukaryotic genes have introns (non - coding regions) and exons (coding regions). Through a process called splicing, introns are removed from the pre - mRNA, and exons are joined together.
• Addition of a 5' cap: A 5' cap (a modified guanine nucleotide) is added to the 5' end of the pre - mRNA. It protects the mRNA from degradation, helps in mRNA export from the nucleus, and is involved in translation initiation.

• Addition of introns: Introns are not added during mRNA processing. They are removed.
• Addition of a 3' cap: There is no such thing as a 3' cap in the standard mRNA processing of eukaryotes. The cap is added to the 5' end.

Answer:

Addition of a 3' poly - A tail, Removal of introns, Addition of a 5' cap.