An action potential can always be initiated specifically at which of the following locations associated with a neuron?
A) ion channels
B) synaptic boutons
C) nodes of Ranvier
D) both choices A and B
E) none of the above
C) nodes of Ranvier
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Examine the figure above, which shows indices of aquatic and terrestrial primary productivity. Based on concentrations of chlorophyll, primary productivity in the ocean
A. is uniform, since the ocean is a single continuous body of water. B. tends to increase with increase temperatures, from the poles to the equator. C. is greatest in the open ocean, due to less air pollution and cloud cover. D. is usually high in warm, tropical seas. E. tends to be high near polar regions, due to seasonal mixing that redistributes nutrients.
The immediate energy system fuels muscle cells
a. with ATP only. b. with ATP and creatine phosphate. c. by glycolysis alone. d. by the Krebs cycle alone. e. by the electron transport system alone.
Some flowers bloom in the spring, while others bloom in the summer. This is an example of reproductive isolation.
A. prezygotic B. sympatric C. allopatric D. parapatric E. postzygotic
What’s the role of oxygen in cellular respiration?
What will be an ideal response?