An invertebrate statocyst contains ____, which surround movable ____; changes in body position move the latter,
triggering action potentials.
a. statoliths; sensory hair cells
b. sensory hair cells; statoliths
c. otoliths; sensory hair cells
d. efferent neurons; otoliths
e. efferent neurons; statoliths
ANSWER: b
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Compared to more distantly related taxa, the DNA sequences of two closely related taxa is expected to show:
A. fewer differences because mutation rates are relatively constant and recently diverging species have had less time to accumulate differences. B. fewer differences because mutation rates slow down during speciation events so that recently diverging species have fewer mutations. C. fewer differences because mutation rates are highly variable and it is just by chance that recently diverging species accumulate fewer differences in DNA sequences. D. greater differences because mutation rates are relatively constant and recently diverging species have had more time to accumulate differences. E. greater differences because mutation rates accelerate during speciation events leading to greater changes in DNA sequences.
Cardiac output is defined as the pressure and amount of blood pumped by the ventricles
Indicate whether the statement is true or false.
Following electrical stimulation of a muscle cell, calcium functions to
A) stimulate the enzymes that produce ATP. B) bind to the protein troponin. C) leak out of the muscle cell to re-establish the membrane potential. D) break down acetylcholine. E) maintain the relaxed state of the muscle.
The first seed plants were the
A. ferns. B. monocots. C. gymnosperms. D. angiosperms.