In the process of creating a trp operon mutant, the UGG codons within the leader sequence were accidentally deleted. Which of the following would be a likely observation in the transcription assays? ___

A. RNA polymerase cannot bind to the promoter. 

B. The operon is permanently inhibited. 

C. Attenuation would be impaired. 

D. Termination would be triggered. 

E. No tryptophan would be made.

TLS Online TPP Program

#Question id: 8921

#Unit 9. Diversity of Life Forms

Evidence of which structure or characteristic would be most surprising to find among fossils of the Ediacaran fauna?

TLS Online TPP Program

#Question id: 15305

#Unit 4. Cell Communication and Cell Signaling

The multi-hit model, which proposes that multiple mutations are needed to cause cancer, which of the following is incorrect regarding to this model?

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#Question id: 10925

#Unit 7. System Physiology – Animal

During the second trimester of pregnancy, where is the predominant site of red blood cell production?

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#Question id: 28399

#Unit 5. Developmental Biology

Dorsal most vegetal cells of the blastula, which are capable of inducing the organizer is known as____

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#Question id: 11484

#Unit 7. System Physiology – Animal

Two students studying physiology taste a known "bitter" substance, and both report sensing bitterness. They then sample another substance. Student A reports sensing both a bitter taste and a salty taste, but student B reports only a salty taste. What is the most logical explanation?