With the E. coli trp operon where both repression and attenuation occur, the extent of regulation achieved by repression is ________ the extent of regulation achieved by attenuation.
A. greater than
B. the same as
C. less than
D. Repression is not used in the regulation of the E. coli trp operon.
Answer: A
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Helium, neon and argon are _____
a. extremely stable because they have vacancies in their outer shells b. extremely stable because they don't have any vacancies in their outer shells c. extremely unstable because they have vacancies in their outer shells d. extremely unstable because they don't have any vacancies in their outer shells e. extremely unstable because they have vacancies in their inner shells
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A. mutualism. B. commensalism. C. predation. D. parasitism. E. herbivory.
Skeletal muscle contractions play a role in returning the venous blood to the heart.
Answer the following statement true (T) or false (F)