How do transcription factors affect gene expression, resulting in observable differences between...
Question:
How do transcription factors affect gene expression, resulting in observable differences between individuals within a population?
They act as repressors that increase gene expression by binding to DNA.
They bind to operons and activate transcription to decrease gene expression.
They bind to regulatory proteins and act as activators to increase gene expression.
They inhibit transcription and decrease gene expression by binding to repressors.
Transcription:
Transcription is the first step in gene expression, which occurs when information stored in DNA is used to make a protein. In transcription, a DNA sequence is copied, or transcribed, into a molecule of mRNA.
Answer and Explanation: 1
The correct answer is: They bind to regulatory proteins and act as activators to increase gene expression. Transcription factors are proteins that bind to DNA sequences in order to activate the transcription of genes. Once bound to the DNA, transcription factors also interact with and bind to other regulatory proteins in order to recruit RNA polymerase, the enzyme that catalyzes transcription. By promoting transcription, these factors also promote gene expression.
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Transcription Factors: Definition, Types & Roles
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Chapter 18 / Lesson 5
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What are transcription factors? This lesson will define transcription factors, discuss their functions, and their unique classes.
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