If reproduction was not limited, how many descendants could a single pair of elephants have after 750 years, according to Darwin's calculations?
a. 15 000
b. 150 000
c. 19 million
d. 190 million
Answer: c. 19 million
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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.
According to Bergmann's rule, as global temperature increases,
A) body size will increase. B) body size will decrease. C) territory size will increase. D) territory size will decrease.
Plants first moved onto land at least ________ years ago
A) 65 million B) 475 million C) 1.2 billion D) 3.5 billion
The aquatic plant Elodea is commonly used to study photosynthesis. You put some Elodea in a test tube, shine light on the plant, and count the bubbles that were released under varying conditions. Which results would you expect to see in your analysis of photosynthetic rate?
A. At low light intensities, the number of bubbles increase as temperature increases and the number of bubbles decrease as carbon dioxide concentration decreases. B. As light intensity increases, the number of bubbles increase and then rapidly decrease. C. At high light intensities, the number of bubbles increase as carbon dioxide concentration increases. D. At high light intensities, the number of bubbles increase when the temperature is increased to human body temperature (37 degrees C). E. The number of bubbles increase indefinitely with increased illumination.