Molecular biologyLesson 5 of 7 in the course Gene Expression

Eukaryotic RNA Splicing and Post-transcriptional Regulation

5 flashcards · 5 quiz questions · 5 match pairs · 5 fill-in sentences · English

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Summary

After a eukaryotic gene is transcribed, its initial RNA transcript usually needs processing before it can be translated. This lesson focuses on RNA splicing and how alternative splicing allows one gene to produce different protein products.

A newly transcribed RNA molecule is not necessarily ready for translation. In many eukaryotic genes, the initial transcript contains both protein-coding regions and intervening regions that must be removed.

All flashcards

What is an exon?
A region retained in mature RNA after splicing; it typically contains information used to make a protein.
What is an intron?
An intervening region of an initial RNA transcript that is removed during splicing.
How does alternative splicing affect gene expression?
It joins different combinations of exons from one transcript, allowing a gene to produce multiple mRNAs and potentially different proteins.
What is RNA stability?
How long an RNA molecule persists before degradation; greater stability can extend the time available for translation.
What does miRNA-guided RISC do?
It binds complementary mRNA sequences and can impede translation or promote mRNA degradation.

Quiz questions

  1. What is the primary protective role of the 5′ cap and poly-A tail on a eukaryotic mRNA?Answer: They help protect the mRNA ends from exonuclease degradation.
  2. Where are the 5′ and 3′ untranslated regions located in a mature mRNA?Answer: The 5′ UTR precedes the coding region, and the 3′ UTR follows it.
  3. Which enzyme processes precursor miRNAs into mature miRNAs?Answer: Dicer
  4. How does the RNA component of RISC identify an mRNA target?Answer: It base-pairs with a complementary sequence on the mRNA.
  5. How can an RNA-binding protein influence the amount of protein produced from an mRNA?Answer: By altering mRNA stability, localization, or translation efficiency.

Based on Biology 2e by Mary Ann Clark, Matthew Douglas, Jung Choi (OpenStax), licensed CC BY 4.0. Adapted into a summary, flashcards and quizzes.

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