1. Introduction to Biology

2. Chemistry

3. Water

4. Biomolecules

5. Cell Components

6. The Membrane

7. Energy and Metabolism

8. Respiration

9. Photosynthesis

10. Cell Signaling

11. Cell Division

12. Meiosis

13. Mendelian Genetics

14. DNA Synthesis

15. Gene Expression

16. Regulation of Expression

17. Viruses

18. Biotechnology

19. Genomics

20. Development

21. Evolution by Natural Selection

22. Evolution of Populations

23. Speciation

24. History of Life on Earth

25. Phylogeny

26. Prokaryotes

27. Protists

28. Plants

29. Fungi

30. Overview of Animals

31. Invertebrates

32. Vertebrates

33. Plant Anatomy

34. Vascular Plant Transport

35. Soil

36. Plant Reproduction

37. Plant Sensation and Response

38. Animal Form and Function

39. Digestive System

40. Circulatory System

41. Immune System

42. Osmoregulation and Excretion

43. Endocrine System

44. Animal Reproduction

45. Nervous System

46. Sensory Systems

47. Muscle Systems

48. Ecology

49. Animal Behavior

50. Population Ecology

51. Community Ecology

52. Ecosystems

53. Conservation Biology

[BOOK BIO] CLUTCH

In the Presence of Tryptophan

The trp operon will be continuously expressed.

The trp operon will be expressed in the presence of tryptophan only.

The trp operon will be expressed in the absence of tryptophan only.

There will be no effect on the trp operon.

If the trp regulatory gene mutates so that the repressor protein can no longer bind to tryptophan what will be the result?

No. It may have a role in inducing sleep in humans, but that is not its basic function.

It is an important constituent of cell walls in both humans and bacteria.

No. It is not particularly used in cell walls, and humans don't have cell walls.

It is an important enzyme in the glycolysis pathway.

No. It is one of the 20 amino acids used to synthesize proteins.

It is one of the 20 amino acids used by all organisms to synthesize proteins.

The pathway that synthesizes tryptophan is an anabolic pathway.

This chapter contains a lengthy discussion of the trp operon involved in regulating the synthesis of tryptophan. In the case of E. coli, the bacterium may need to synthesize tryptophan, or its host, a human, may supply all the tryptophan it needs. Why do both bacteria and humans need tryptophan?

The Trp Operon

trp Operon | Tryptophan Operon

trp operon

Thinking Through the trp Operon

The trp&nbsp;operon consists of ________ genes that encode tryptophan biosynthesis enzymes.

trp Operon & Attenuation explained in under 15 minutes

Tryptophan Operon

Yes, this is why tryptophan is the co-repressor of the trp operon.

No, this is why tryptophan is the inducer of the trp operon.

Yes, this is why tryptophan is the repressor of the trp operon.

Based on the information you know about the trp operon, is the creation of tryptophan expensive to the cell?

Trp Operon

The inducer cannot bind to the operator, so trp operon transcription occurs.

The active repressor cannot bind to the operator, so trp operon transcription is reduced.

The inactive repressor cannot bind to the operator, so trp operon transcription occurs.

The repressor binds to the corepressor, and trp operon transcription occurs.

The active repressor binds to the operator, so trp operon transcription is repressed.

In the absence of tryptophan, ______:

If a particular operon encodes enzymes for making an essential amino acid and is regulated like the trp operon, then
a. the amino acid inactivates the repressor.
b. the repressor is active in the absence of the amino acid.
c. the amino acid acts as a corepressor.
d. the amino acid turns on transcription of the operon.

In the Absence of Tryptophan

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