Besides Darwin, the theory of evolution by means of natural selection was also independently proposed by:
A. Thomas Malthus.
B. Peter Raven.
C. Alfred Wallace.
D. Karl Popper.
E. Charles Lyell.
Answer: C
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All of the following could be used to describe some aspect of a cartilage cell EXCEPT
a. chondrocyte. b. calcium salts. c. ground substance. d. chondroblast. e. matrix.
Which wavelengths of light are most likely to be absorbed by chlorophyll b?
A. UV B. blue C. red D. infrared
Several chemical pollutants from a paper mill are released into the nearby environment. Compound A is rich in calcium and magnesium. Compound B binds tightly to all free polypeptides and proteins in the soil
Compound C is structurally similar to abscisic acid. Based on this scenario, which compound will most likely harm the surrounding vegetation, and what effect(s) will it have on the plants? A) Compound A, because these minerals will act as toxins to the plant as they are absorbed through the roots. B) Compound C, because abscisic acid inhibits the active transport of potassium ions and thus closes the stomata, which will interfere with CO2 uptake and H2O transport. C) Compound B, because it ties up free polypeptides and proteins in the soil, preventing their uptake by plants, which is critical for plant growth.
In the summer, a lake's thin layer of water beneath the top layer where the temperature drops rapidly is known as the ____.
A. halocline B. thermocline C. pycnocline D. hypocline E. hypercline