"Saltatory conduction" means that the membrane potential changes __________.
A) only at the nodes of Ranvier
B) only where there is diffusion of sodium and potassium ions
C) in an all-or-none fashion
D) along the entire length of the axon
E) from polarized to depolarized and back to polarized
Answer: A) only at the nodes of Ranvier
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At a minimum, primary producers require water, carbon dioxide, and light. These are things that are readily available in most ecosystems. However, we do not observe the same rates of net primary productivity in every region of the globe
Which of the following statements best reflects one reason why rates of productivity are not the same everywhere? A. Rates of net primary productivity are actually the same everywhere; scientists just need to calculate the rates relative to plant biomass in a given ecosystem. B. Although water is limited in certain ecosystems, nutrients that are scarce actually limit net primary productivity because they are necessary for growth. C. Although water is limited in certain ecosystems, irrigation would solve the problem and equalize rates of net primary productivity in every ecosystem. D. Rates of net primary productivity are actually limited by the amount of solar radiation. If net primary productivity were calculated as a yearly average, then this would show that ecosystems have the same rate of productivity.
In which organism were phagocytes first reported?
A. Bacteria B. Amoeba C. Red blood cells D. Starfish larvae
If your mother and father both are healthy but carry the allele for cystic fibrosis, which is caused by a
recessive allele, the odds of your having at least one allele for the disorder are
a. 1/4. b. 1/2. c. 3/4. d. 1. e. 0.
The loudness of sound is measured in
a. millihertz. b. decibels. c. megahertz. d. watts. e. gigahertz.