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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

Tryptophan Operon and Attenuation

Genetics

12. Gene Regulation in Prokaryotes

Tryptophan Operon and Attenuation

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Multiple Choice

Tryptophan regulates the trp operon by doing what?

Activating the operon and synthesizing more tryptophan

Activating the operon and breaking down tryptophan

Repressing the operon and inhibiting further tryptophan synthesis

Repressing the operon and inhibiting breakdown of tryptophan

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Verified step by step guidance

Understand the role of the trp operon: The trp operon is a group of genes used by bacteria to synthesize tryptophan when it is not available in the environment.

Identify the mechanism of regulation: The trp operon is regulated by a repressor protein that binds to the operator region of the operon.

Recognize the role of tryptophan: Tryptophan acts as a corepressor, meaning it binds to the repressor protein, enabling it to attach to the operator and block transcription.

Determine the effect of tryptophan presence: When tryptophan levels are high, it binds to the repressor, activating it to repress the operon, thus inhibiting further synthesis of tryptophan.

Conclude the regulatory outcome: The presence of tryptophan represses the operon, preventing the synthesis of enzymes needed for tryptophan production, thereby conserving resources.