Table of contents

1. Introduction to Genetics51m
2. Mendel's Laws of Inheritance3h 37m
3. Extensions to Mendelian Inheritance2h 41m
4. Genetic Mapping and Linkage2h 28m
5. Genetics of Bacteria and Viruses1h 21m
6. Chromosomal Variation1h 48m
7. DNA and Chromosome Structure56m
8. DNA Replication1h 10m
9. Mitosis and Meiosis1h 34m
10. Transcription1h 0m
11. Translation58m
12. Gene Regulation in Prokaryotes1h 19m
13. Gene Regulation in Eukaryotes44m
14. Genetic Control of Development44m
15. Genomes and Genomics1h 50m
16. Transposable Elements47m
17. Mutation, Repair, and Recombination1h 6m
18. Molecular Genetic Tools19m
- Genetic Cloning
  9m
- Methods for Analyzing DNA
  9m
19. Cancer Genetics29m
- Overview of Cancer
  21m
- Cancer Mutations
  7m
20. Quantitative Genetics1h 26m
21. Population Genetics50m
- Hardy Weinberg
  19m
- Allelic Frequency Changes
  31m
22. Evolutionary Genetics29m

12. Gene Regulation in Prokaryotes

Arabinose Operon

Genetics

12. Gene Regulation in Prokaryotes

Arabinose Operon

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Multiple Choice

When arabinose is present, the arabinose operon is what?

Active – meaning the genes are being transcribed

Inactive – meaning the genes are not being transcribed

Nothing, arabinose does not control the arabinose operon

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Verified step by step guidance

Understand the concept of an operon: An operon is a cluster of genes under the control of a single promoter and is transcribed together. The arabinose operon is a set of genes involved in the metabolism of arabinose, a sugar.

Identify the role of arabinose: Arabinose acts as an inducer for the arabinose operon. When present, it binds to a regulatory protein, which in turn affects the transcription of the operon.

Examine the regulatory mechanism: In the absence of arabinose, the regulatory protein (AraC) binds to the operator region in a way that prevents transcription. This keeps the operon inactive.

Analyze the effect of arabinose presence: When arabinose is present, it binds to the AraC protein, causing a conformational change that allows RNA polymerase to access the promoter and initiate transcription of the operon.

Conclude the operon's state: With arabinose present, the operon is active, meaning the genes are being transcribed. This is because the presence of arabinose facilitates the transcription process by altering the regulatory protein's binding to the DNA.