After transcription begins, several steps must be completed before the fully pro

Question

After transcription begins, several steps must be completed before the fully processed mRNA is ready to be used as a template for protein synthesis on the ribosomes.

Which three statements correctly describe the processing that takes place before a mature mRNA exits the nucleus?

1.Coding sequences called exons are spliced out by ribosomes.
2. A cap consisting of a modified guanine nucleotide is added to the 5' end of the pre-mRNA.
3. A translation stop codon is added at the 3' end of the pre-mRNA.
4. Noncoding sequences called introns are spliced out by molecular complexes called spliceosomes.
5. A poly-A tail (50-250 adenine nucleotides) is added to the 3' end of the pre-mRNA.

Explanation / Answer

The answer is 2,4,5....Those are the correct one!

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