List the four elements that account for over 90% of the mass of living organisms and identify an
important biological function of each element. What will be an ideal response?
Some examples from Table 2-1: Oxygen is required for cellular respiration, carbon forms the
backbone of organic molecules, hydrogen is involved in some energy transfers, and nitrogen is a
component of proteins and nucleic acids.
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The term saltatory propagation refers to the:
A. involvement of ions such as sodium and potassium in production of the action potential. B. ability of an action potential to "jump" from one node of Ranvier to the next. C. tendency of an action potential to move in one direction. D. All of the answer options are correct.
Briefly describe the ecological importance of coastal seas
What will be an ideal response?
The condition of the fire ant in the above photograph
is caused by a. biological control with phorid flies. b. pesticides. c. wholesale physical destruction of their mounds. d. herbicides. e. all of these.
All living organisms are dependent upon plants because
a. plants produce carbon dioxide as a by-product of photosynthesis. b. as producers, they form the base of food chains. c. they function to prevent erosion and reduce desertification. d. they remove oxygen from the atmosphere. e. they contribute to the problems generated by the greenhouse effect.