Poly A tail:
Correct answer: C. 3' end
- A. Core enzyme
- B. U ribonucleotide
- C. 3' end
- D. Sigma factor
Explanation
The poly-A tail is a stretch of adenine nucleotides added to the 3' end of pre-messenger RNA (pre-mRNA) during mRNA processing. This modification is crucial for stabilizing the mRNA molecule and facilitating its export from the nucleus to the cytoplasm. Additionally, the poly-A tail plays a role in regulating gene expression and enhancing translation efficiency. Therefore, the poly-A tail is directly related to the 3' end of mRNA, as it is added specifically to this end during mRNA processing.
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About Chromosomes
Chromosomes are DNA-protein structures that carry genes and become visible during cell division. Coverage includes chromatin, centromeres, sister chromatids, homologous chromosomes, chromosome number, and the distinction between diploid and haploid cells, with links to DNA replication, mitosis and meiosis.
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