The "threshold" potential of a membrane is the _____
A) point of separation from a living to a dead neuron
B) lowest frequency of action potentials a neuron can produce
C) minimum hyperpolarization needed to prevent the occurrence of action potentials
D) minimum depolarization needed to operate the voltage-gated sodium and potassium channels
E) peak amount of depolarization seen in an action potential
Answer: D
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A) community B) population C) niche D) biosphere
Bony fishes possess a swim bladder to
A. regulate their buoyancy. B. detect changes in water pressure. C. cleanse the blood of toxins. D. store urine until excreted. E. regulate oxygen concentrations in their blood.
Franklin's assignment at Cambridge was to investigate the structure of ____.
A. proteins B. ultraviolet radiation C. DNA D. embryonic fluid E. lipids
Binary fission is:
A. cell division by simple splitting B. exchange of genes between two cells C. fluorescent in situ hybridization (FISH) D. cell division by meiosis E. cell division by mitosis