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

Review of the Lac Operon & Trp Operon

Microbiology

15. Central Dogma & Gene Regulation

Review of the Lac Operon & Trp Operon

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Multiple Choice

Which of the following statements is TRUE?

Lac I is the inducer molecule for the lac operon.

Tryptophan is an inducer molecule for the trp operon.

In the presence of lactose, the lac operon is expressed.

In the presence of tryptophan, the trp operon is expressed.

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Verified step by step guidance

Understand the concept of operons: Operons are clusters of genes regulated together, typically found in prokaryotes. The lac operon and trp operon are classic examples used to study gene regulation.

Identify the role of inducer molecules: Inducer molecules are substances that initiate the expression of genes within an operon. For the lac operon, lactose acts as the inducer, while tryptophan acts as a corepressor for the trp operon.

Examine the lac operon: In the presence of lactose, the lac operon is activated. Lactose binds to the repressor protein, causing it to release from the operator site, allowing transcription of the operon genes.

Examine the trp operon: In the presence of tryptophan, the trp operon is repressed. Tryptophan binds to the repressor protein, enabling it to attach to the operator site, preventing transcription of the operon genes.

Evaluate the statements: Based on the understanding of the lac and trp operons, determine which statement accurately reflects the behavior of these operons in the presence of their respective molecules.