Health, 10.03.2020 19:16 SearchLight
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?
a. A translation stop codon is added at the 3' end of the pre-mRNA.
b. A cap consisting of a modified guanine nucleotide is added to the 5' end of the pre-mRNA.
c. A poly-A tail (50-250 adenine nucleotides) is added to the 3' end of the pre-mRNA.
d. Coding sequences called exons are spliced out by ribosomes.
e. Noncoding sequences called introns are spliced out by molecular complexes called spliceosomes.
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After transcription begins, several steps must be completed before the fully processed mRNA is ready...
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