The vertebrate jaw first appeared in which organism?
a. fishes
b. amphibians
c. reptiles
d. birds
e. mammals
a
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Tissues are to __________ as organs are to organ systems
a. cells b. organs c. organisms d. all of these
Which field of biology is concerned with the diversity and relatedness of organisms?
A) morphology B) phylogeny C) systematics D) evolution
During the rapid increase in membrane potential seen in the upsweep of the action potential, which of the following is TRUE?
A. Both the activation and inactivation gates of the voltage-gated sodium channels are open. B. The voltage-gated potassium channel is open. C. The potassium leak channels are closed. D. The sodium leak channels are closed. E. The sodium/potassium pump has reversed directions and is pumping sodium in and potassium out.
A microorganism that has an optimum growth temperature of 37°C, but can survive short exposure to high temperatures is called a(n) ________.
A. thermophile B. thermoduric microbe C. facultative psychrophile D. extremophile E. psychrophile