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 FALSE?

The lac operon is an inducible operon that is normally turned off.

The trp operon is a repressible operon that is normally turned on.

Lactose is the inducer molecule for the lac operon.

Tryptophan is the activator molecule for the trp operon.

All of the above are true.

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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. They consist of structural genes, a promoter, and an operator.

Differentiate between inducible and repressible operons: Inducible operons, like the lac operon, are usually off and can be turned on by an inducer. Repressible operons, like the trp operon, are usually on and can be turned off by a repressor.

Examine the lac operon: The lac operon is controlled by the presence of lactose, which acts as an inducer. When lactose is present, it binds to the repressor, allowing transcription of genes involved in lactose metabolism.

Examine the trp operon: The trp operon is controlled by the presence of tryptophan. When tryptophan levels are high, it acts as a corepressor, binding to the repressor and inhibiting transcription of genes involved in tryptophan synthesis.

Identify the false statement: The statement 'Tryptophan is the activator molecule for the trp operon' is false because tryptophan acts as a corepressor, not an activator.