Before another action potential, what must happen?
a. There must be a restoration of the resting conditions in the membrane.
b. The membrane voltage must drop to zero.
c. The sodium-potassium pump must cease temporarily.
d. All of the membrane gates must be closed at the same time.
e. Potassium must move into the cell.
a
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Which of the following is NOT an autoimmune disease?
A. multiple sclerosis B. type I diabetes C. myasthenia gravis D. HIV E. All of these conditions are autoimmune diseases.
Why did the scientists assume the plants and
animals they encountered in the cloud forest on top of New Guinea’s Foja Mountains had never been encountered by other humans before?
a. these species were unknown to even the native peoples b. the animals were unafraid of humans c. they found some species that were thought to have been extinct for decades d. none of these answers are correct e. all of these answers are correct except d
The spiders in the diagram above are
A. tertiary consumers.
B. herbivores.
C. at the third trophic level.
D. omnivores.
Bacteria of the genus Mycoplasma lack cell walls. What sort of environment do they require for survival?
A) low temperature B) hypotonic C) isotonic D) hypertonic E) a biofilm