Which of the following statements about axonal membranes is NOT true?
A. The sodium-potassium pump establishes a concentration gradient across the membrane.
B. The resting potential of a typical neuron is -70 mV.
C. There is an electrical potential difference across a neuron's membrane.
D. The polarity correlates with a difference in ion distribution across the membrane.
E. At rest, there is a higher concentration of sodium ions inside the axon.
Answer: E
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Ecologists are concerned about amphibian populations because
A. their loss would be an aesthetic loss to the planet. B. of the possibility of numerous medicinal uses. C. they are keystone species in many areas—their loss will cause other populations to crash. D. amphibians are very sensitive to environmental change—they may be indicating serious problems. E. they are increasing to the point of competing with indigenous species.
The event called the Cambrian Explosion resulted in an abrupt increase in
A. geological activity. B. diversity of major animal groups. C. algal diversity. D. the number of days in the year. E. the amount of fish, of a single species, in the seas.
DNA synthesis proceeds by the elongation of primer chains, always in the
A. 5' to 3' direction. B. 3' to 5' direction. C. 5' to 5' direction. D. 3' to 3' direction.
Effects a virus can have on a host cell
What will be an ideal response?