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 activity level of adenyl cyclase
C. The level of tryptophan in the environment
D. The level of trp-tRNA that is charged with tryptophan
Answer: D
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What other information is related to the question? Which information is most useful?
What will be an ideal response?
Answer the question using the accompanying figure. Mitosis is occurring in step(s) ____
a. 7 only b. 8 only c. 10 only d. 7 and 8
e. 7, 8, and 10Achondroplasia ____
a. is inherited as an autosomal recessive condition b. affects about one in one million people c. affects only homozygotes d. is characterized by abnormally short arms and legs
e. is inherited as an X-linked disorderHomeostasis provides what kind of internal
environment? a. positive b. relatively constant c. limiting d. changing e. chemical and physical