alleryStart learning →About how many adenine residues does poly-A polymerase add to a pre-mRNA?
AAbout 200 residues
BAbout 20 residues
CAbout 2,000 residues
DAbout 40 residues
Answer & Solution
Correct answer: A. About 200 residues
1. Once elongation is complete the transcript is cut near its 3' end.
2. Poly-A polymerase then adds a string of approximately 200 A residues.
3. This poly-A tail protects the transcript from degradation and signals its export to the cytoplasm.
_Source: OpenStax Biology (1st ed., CC BY 4.0), Ch 15 "Genes and Proteins", section 15.4 RNA Processing in Eukaryotes_
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