In saltatory conduction, the membrane is depolarized only in the region of the myelin sheath
____________________ Indicate whether the statement is true or false.
F, nodes of Ranvier
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Blister rust is an invasive disease that most impacts the __________ population
a. American chestnut tree b. bald eagle c. grizzly bear d. Siberian tiger
Ingo Potrykus and Peter Beyer introduced genes for
the production of beta-carotene, a precursor of vitamin A, into rice. They used rice because rice a. is the main food for people in impoverished countries. b. plants were readily available to them. c. plants can produce some vitamin A on their own. d. is otherwise a complete nutrient source. e. is all of these.
In an experiment to track the movement of growth factor molecules from secretion to the point of receptor binding in a particular species of mammal, a student found a 20-fold reduction in mm traveled when in the presence of an adrenal hormone. This is in part attributable to which of the following?
A) The growth factor is a paracrine signal. B) The growth factor depends on osmosis. C) The mammal only carries growth factor through the lymph. D) The growth factor is an exocrine signal. E) The growth factor is an endocrine signal.
If you took a plant that was accustomed to bight light and moved it into a dark area, you would expect transpiration to
1) Increase 2) Decrease 3) Stay the same