If a toxin, such as a bacterial toxin, destroys ribosomes, what cellular activity will be affected first?
a. protein synthesis
b. DNA synthesis
c. movement
d. energy storage
e. active transport
a
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Which of these are the main structural components of biological membranes?
a. starches b. triglycerides c. proteins d. phospholipids e. steroids
All of the following statements concerning the theory of evolution by natural selection are true EXCEPT:
(A) Organisms produce far more offspring than are required for replacement. (B) The individuals in a population show variation in survivability and in their ability to cope with environmental stress. (C) The number of offspring that survive to reproduce varies among individuals. (D) The bodies of organisms in a population change by use and disuse, and the changes are inherited by the next generation.
A set of local communities that are linked by the dispersal of multiple, potentially interacting species is referred to as a(n)
A) ecotone. B) archipelago. C) metapopulation. D) metacommunity.
Much of the loss of biologically available nitrogen in the ocean is now thought to be due to a consortium of microbes carrying out ________.
A. the anammox reaction B. nitrogen fixation C. nitrification D. denitrification