Table of contents

1. Introduction to Microbiology3h 22m
2. Disproving Spontaneous Generation1h 18m
3. Chemical Principles of Microbiology3h 38m
4. Water1h 28m
5. Molecules of Microbiology2h 23m
6. Cell Membrane & Transport3h 28m
7. Prokaryotic Cell Structures & Functions5h 52m
8. Eukaryotic Cell Structures & Functions2h 18m
9. Microscopes2h 46m
10. Dynamics of Microbial Growth4h 36m
11. Controlling Microbial Growth4h 10m
12. Microbial Metabolism5h 16m
13. Photosynthesis2h 31m
14. DNA Replication2h 25m
15. Central Dogma & Gene Regulation7h 14m
16. Microbial Genetics4h 44m
17. Biotechnology3h 0m
18. Viruses, Viroids, & Prions4h 56m
19. Innate Immunity7h 15m
20. Adaptive Immunity7h 14m
21. Principles of Disease6h 57m

15. Central Dogma & Gene Regulation

Introduction to Regulation of Gene Expression

Microbiology

15. Central Dogma & Gene Regulation

Introduction to Regulation of Gene Expression

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Multiple Choice

Which of the following is an example of positive regulation of gene expression?

Transcription is halted on a specific gene to limit the amount of protein being created by the gene's expression.

The protein that is translated is immediately degraded by the cell before it can serve its function.

Elongation of translation comes to a stop and the ribosome dissociates when a regulatory protein binds.

A protein binds to DNA and then stimulates the initiation of transcription of a specific gene.

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Verified step by step guidance

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.