The Latin phrase omnis cellula e cellula refers to a cellular principle. Which of the following statements is the best interpretation of this phrase?
A) Tissues are composed of similar cells.
B) Cells generally are found in clusters.
C) All cells arise only from preexisting cells.
D) Organs are composed of tissues and cells.
E) The cell is the basic unit of structure.
Answer: C
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What stops the rapid depolarization that occurs as the "upsweep" of membrane potential peaks during the action potential?
A. Closing of the voltage-gated Na+ channel activation gate. B. Closing of the voltage-gated Na+ channel inactivation gate. C. Opening of the voltage-gated K+ channel gate. D. Both opening of the K+ channel gate and closing of the Na+ channel inactivation gate. E. Both opening of the K+ channel gate and closing of the Na+ channel activation gate.
Shade-grown coffee in mixed polycultures is a good example of _________________.
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A) 1 B) 3/4 C) 1/2 D) 1/4 E) 0