Notes for D1.2.4 Transcription as a process required for the expression of genes - IB | RevisionDojo
D1.2.4 Transcription as a process required for the expression of genes Notes
Not all genes are active all the time.
Transcription is a critical control point where gene expression can be switched on or off.
Why Control Transcription?
Efficiency: Cells save energy by producing proteins only when needed.
Specialization: Different cell types express different genes to perform unique functions.
Adaptation: Cells can respond to environmental changes by turning genes on or off.
Analogy
Think of transcription as a light switch.
Promoters and transcription factors are the hands that turn the switch on or off.
The Transcriptome: A Dynamic Snapshot
The transcriptome is the complete set of RNA molecules produced in a cell at a given time.
It varies between cell types and changes in response to the cell’s needs.
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Questions
Recap questions
1 of 5
Question 1
Recap question
In the “light switch” analogy of transcriptional control, which component best represents a promoter and why?
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Note
The process of transcription is essential for gene expression, as it converts DNA into RNA, which can then be translated into proteins. This process is tightly regulated to ensure that genes are expressed only when needed.
