Multiple Choice
Post-translational control refers to:
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15. Central Dogma & Gene Regulation
Introduction to Regulation of Gene Expression
Multiple Choice
Which of the following is an example of positive regulation of gene expression?
A
Transcription is halted on a specific gene to limit the amount of protein being created by the gene's expression.
B
The protein that is translated is immediately degraded by the cell before it can serve its function.
C
Elongation of translation comes to a stop and the ribosome dissociates when a regulatory protein binds.
D
A protein binds to DNA and then stimulates the initiation of transcription of a specific gene.
Verified step by step guidance1
Understand the concept of gene expression regulation: Gene expression can be regulated at various stages, including transcription, translation, and post-translation. Positive regulation involves mechanisms that increase the expression of a gene.
Identify the key feature of positive regulation: In positive regulation, a regulatory protein (often called an activator) binds to a specific site on the DNA, enhancing the transcription of the gene.
Analyze the options given: Each option describes a different scenario of gene expression regulation. Look for the one that involves an increase in gene expression due to a regulatory protein.
Evaluate the correct option: The option stating 'A protein binds to DNA and then stimulates the initiation of transcription of a specific gene' describes a scenario where a protein (activator) enhances transcription, which is characteristic of positive regulation.
Conclude the analysis: The correct example of positive regulation is when a protein binds to DNA and stimulates transcription, as this increases the gene's expression.
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