Background extinction rates eliminate approximately ____ species ____
a. 7-8; per 100 years
b. 7-8; per 1000 years
c. 7-8; per year
d. 100; per year
e. 100; per 1000 years
ANSWER: c
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Sustained muscle contraction without relaxation between successive stimuli is called _____
A) tonus B) tetanus C) an all-or-none response D) fatigue E) a spasm
More than 60% of all prescribed drugs target ____, due to their wide physiological impact
a. receptor tyrosine kinases b. hormone receptors c. guanylyl cyclase d. ligand-gated ion channels e. G-protein-coupled receptors
In humans, ____________________ functions to transfer genetic information from the nucleus to the
cytoplasm. Fill in the blank(s) with the appropriate word(s).
What would be an easy way to determine if a skull is a mammal's skull?
A. Look for the remains of the tympanum. B. Examine the teeth. C. Measure the brain case volume. D. Look for air sacs in the skull.