Neuroglial Schwann cells produce ____, which _____
a. neurotransmitters; are unnecessary for proper nervous signal conduction
b. the myelin sheath; maintain the resting potential in neurons
c. the myelin sheath; increases the speed of an action potential
d. neurotransmitters; conduct signals across synapses
e. meninges; provide neurotransmitters to neurons
ANSWER: c
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A researcher is comparing atmospheric CO2 levels in Earth's northern and southern hemispheres during June-August. As more terrestrial plants are present in the northern hemisphere, what do you expect she will find?
A. Atmospheric CO2 measurements will be greater in the northern hemisphere. B. Atmospheric CO2 measurements will be greater in the southern hemisphere. C. As atmospheric CO2 measurements represent global amounts, measurements in the northern and southern hemispheres will be (approximately) the same.
Molecular motors associated with the cytoskeleton allow molecules to move through the cell faster than the speed of diffusion
A. true B. false
What traits do green algae and plants have in common?
_____ plastids. _____ chlorophyll a and b. _____ a sporic life cycle. _____ beta-carotene. _____ embryos.
In 1992, mangrove forests along the southern Florida coast and the Florida Keys were severely damaged by Hurricane Andrew. Up to 94% mortality was recorded in some areas, with only the shortest individuals surviving. Scientists have monitored the region and by 2001, the forest canopy had closed and the main species were rapidly gaining biomass. This is an example of:
A. island biogeography B. inhibition. C. the diversity-stability hypothesis D. primary succession. E. secondary succession.