Which operons are never transcribed unless activated?
a. Inducible operons
b. Repressible operons
c. Inducible and repressible operons
Answer: a. Inducible operons
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When considering the wormlike phyla within the protostomes, which feature is most useful in distinguishing groups?
A) the type of body cavity B) the presence or absence of a hemocoel C) feeding structures or mouthparts D) presence of a hydrostatic skeleton
Members of the genus Micrococcus are usually ________.
A. microaerophilic B. facultatively anaerobic C. aerobic D. anaerobic
Lymph nodes filter _____
a. blood c. plasma b. lymph d. all of these
Identify the key feature of the action potential that ensures it will travel only one direction.
A. the activation state of the voltage-gated Na+ channel B. the temporary cessation in activity of the Na+/K+ pump C. the inactivation state of the voltage-gated K+ channel D. the activation state of the voltage-gated K+ channel E. the inactivation state of the voltage-gated Na+ channel