An action potential begins in a neuron's trigger zone, the part of the axon adjacent to the cell body. When a neuron is at rest, this region's gated channels for sodium and potassium are ____
a. closed
b. both open
c. both open but inactive
d. open only at gated sodium channels
e. open only at gated potassium channels
a
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The disease osteoporosis involves loss of both mineral and organic components from bones. Which of the following can contribute to the development of osteoporosis?
A. prolonged disuse of muscles B. decline in estrogen following menopause in women C. lack of calcium in the diet D. lack of vitamin D in the diet E. All of the choices for this question are correct
Canada geese have become a major source of Giardia and Cryptosporidium contamination of soil and fresh water.
Answer the following statement true (T) or false (F)
Major gene reshuffling takes place during
a. prophase I. b. metaphase I. c. anaphase I. d. metaphase II. e. anaphase II.
Which of the following is strongly associated with net primary productivity?
A) sea surface temperatures B) actual evapotranspiration C) ocean biodiversity D) increased altitude