What is the key factor determining whether or not attenuation will occur when transcription of the E. coli trp operon has been initiated?
A. The trp operon repressor
B. The level of tryptophan in the environment
C. The activity level of adenyl cyclase
D. The level of trp-tRNA that is charged with tryptophan
Answer: D
You might also like to view...
Which is the key component in the process of successfully going from small-scale fermentation to large-scale industrial fermentation?
A. Finding the right organism to repeatedly produce one liter of product. B. Developing a suitable culture media. C. Success in producing one liter of product. D. The scale-up process is paramount.
Which valve is also known as the mitral valve?
a. bicuspid b. tricuspid c. right AV d. aortic valve e. left semilunar
Which one of the following would result in passive immunity?
A) vaccination B) past occurrence of an infection or disease C) production of memory cells D) movement of antibodies across the placenta from mother to child E) stimulation of T cells and B cells by an antigen
People who attempted to plant Brazil nuts in hopes of establishing plantations of Brazil nut trees played roles most similar to those of _____
A) agoutis B) orchid bees C) pollen tubes D) harpy eagles