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Eukaryotic RNA Processing and Splicing quiz

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  • What is the main purpose of RNA processing and splicing in eukaryotes?
    RNA processing and splicing convert premature mRNA (pre-mRNA) into mature mRNA that is ready for translation.
  • What are the two main modifications made to the ends of pre-mRNA during RNA processing?
    A 5' cap is added to the 5' end, and a poly-A tail is added to the 3' end of the pre-mRNA.
  • What is the 5' cap composed of, and where is it added?
    The 5' cap is a modified guanine nucleotide added to the 5' end of the pre-mRNA.
  • What is the poly-A tail, and where is it added?
    The poly-A tail is a sequence of adenine nucleotides added to the 3' end of the pre-mRNA.
  • List one function of the 5' cap and poly-A tail.
    They help facilitate export of mRNA from the nucleus to the cytoplasm.
  • How do the 5' cap and poly-A tail protect mRNA?
    They protect mRNA from degradation by enzymes.
  • Why are the 5' cap and poly-A tail important for translation?
    They help ribosomes attach to the mRNA for translation to occur.
  • What is RNA splicing, and where does it occur?
    RNA splicing is the removal of introns and reconnection of exons in pre-mRNA, and it occurs only in eukaryotes.
  • What are introns and what happens to them during RNA splicing?
    Introns are non-coding regions that are removed from pre-mRNA during splicing.
  • What are exons and what happens to them during RNA splicing?
    Exons are coding regions that are reconnected and expressed in the mature mRNA.
  • What is the spliceosome and what is its role?
    The spliceosome is a large complex of RNA and protein that removes introns and splices exons together.
  • What is alternative RNA splicing?
    Alternative RNA splicing is the process by which a single gene can be spliced in different ways to produce multiple protein variants.
  • How can alternative splicing affect the protein produced from a gene?
    It can change which exons are included in the mature mRNA, resulting in proteins with different structures and functions.
  • Do prokaryotes undergo RNA processing and splicing?
    No, RNA processing and splicing are processes unique to eukaryotes.
  • What is the final product of RNA processing and splicing?
    The final product is mature mRNA that is ready for translation into protein.