The main nitrogenous waste of freshwater fishes is:
a. ammonia.
b. urea.
c. uric acid.
d. amino acids.
e. purines.
A
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The cytoplasmic membrane of bacteria
A. acts as a selectively permeable barrier, allowing some molecules to pass while preventing the movement of others. B. is the major site of ATP synthesis in aerobes. C. retains the cytoplasm and its contents. D. All of the choices are correct.
Identify the principal role of cellular respiration
A) To convert solar energy into the chemical energy of sugars B) To convert kinetic energy into the chemical energy of sugars C) To convert the chemical energy of sugars into the chemical energy that fuels life's processes D) To convert the chemical energy of sugars into heat to maintain an elevated body temperature
Whenever a species of an organism has been introduced into an area that contains a variety of unfilled niches, a variety of ecological opportunities are available and the descendants of this species evolve in a variety of ways. These variations permit the organisms to take advantage of these ecological opportunities. This illustrates
A. the inheritance of characteristics that the individual developed as a response to the forces of the environment. B. convergence. C. polyploidy. D. adaptive radiation.
The use of chemical agents to harm or kill microbes is
A) immunology. B) chemotherapy. C) epidemiology. D) serology. E) biotechnology.