Molecular biologyLesson 1 of 3 in the course Gene Expression

Prokaryotic and Eukaryotic Gene Expression Regulation

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

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Summary

Cells need the right proteins in the right places and at the right times. This lesson introduces gene expression, explains why cells regulate it, and shows how prokaryotic cells primarily control protein production.

Gene expression is the process of using information in a gene to produce RNA and, when appropriate, a protein. A cell must control whether a gene is active, how much product is made, and when production should stop.

All flashcards

Gene expression
Using information in a gene to produce RNA and, when appropriate, a protein.
Why regulate gene expression?
To make needed products at appropriate times and amounts while conserving energy, materials, and space.
Prokaryotic transcriptional regulation
Controlling gene transcription is the primary way prokaryotes regulate protein production.
Compartmentalization in eukaryotic cells
Organization into distinct internal regions that provides additional points for regulating gene expression.
Post-translational regulation
Control of a protein after translation that can affect its function or availability.

Quiz questions

  1. Where does transcription occur in a eukaryotic cell?Answer: In the nucleus, where the cell's DNA is housed.
  2. What is controlled by translational regulation?Answer: Whether and how efficiently ribosomes use RNA to make protein.
  3. What does epigenetic regulation of gene expression involve?Answer: Changing DNA accessibility by altering how tightly it is packaged.
  4. How can gene silencing help defend a cell during infection?Answer: It can shut down gene expression for a period of time.
  5. What happens to newly made eukaryotic RNA before it can be translated in the cytoplasm?Answer: It can be processed and transported out of the nucleus.

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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