Four of the five factors listed below affect simple
diffusion. Select the exception.
a. temperature
b. pressure
c. characteristic of the membrane
d. size of the molecules
e. concentration gradient
Answer: c
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Living organisms increase in complexity as they grow, resulting in a decrease in the entropy of an organism. How does this relate to the second law of thermodynamics?
A) Living organisms do not obey the second law of thermodynamics, which states that entropy must increase with time. B) Life obeys the second law of thermodynamics because the decrease in entropy as the organism grows is exactly balanced by an increase in the entropy of the universe. C) Living organisms do not follow the laws of thermodynamics. D) As a consequence of growing, organisms cause a greater increase in entropy in their environment than the decrease in entropy associated with their growth. E) Living organisms are able to transform energy into entropy.
Global estimates of denitrification in terrestrial ecosystems vary widely but are of the order 200 × 1012 g/yr, and more than half of that total occurs in wetland ecosystems
If restoration results in an increase in wetland area by approximately 25 percent, it would be expected that losses of nitrogen through denitrification would be closer to A) 175 × 1012 g/yr. B) 225 × 1012 g/yr. C) 275 × 1012 g/yr. D) 325 × 1012 g/yr.
Which of the following statements does not accurately describe the navigational ability of homing in birds?
A. Homing pigeons have map sense, which most likely includes landmarks as well as olfactory and visual cues. B. Homing pigeons use the sun and stars as well as the magnetic field to find their way "home" over long distances. C. If a homing pigeon is fitted with a magnetic helmet, it would not be able to find its way on a cloudy day. D. If a homing pigeon is fitted with a magnetic helmet, it would not be able to find its way on a cloudy day, but it would be able to navigate on a sunny day because it would still be able to use the sun as a compass. E. A biological clock used for time cues is not necessary for a homing pigeon to use the sun compass.
Water can move inside a root via the
a. symplastic pathway. b. transmembrane and symplastic pathways. c. transmembrane pathway. d. apoplastic, transmembrane, and symplastic pathways. e. apoplastic pathway.