When cells in an organism associate with each other, they form ______.
A. atoms
B. molecules
C. macromolecules
D. tissues
E. populations
D. tissues
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Quorum sensing is ___:
a. the ability to respond to changes in population density b. a characteristic allowing secretion of a matrix c. dependent on direct contact among cells d. associated with colonies in broth culture
Formation of a tetraploid plant species from two different diploid parental species of plants is an example of
A. punctuated equilibrium. B. gradualism. C. extinction. D. a postzygotic barrier to evolution. E. a prezygotic barrier to evolution.
In plants, the light-dependent reactions require
A. Calvin cycle enzymes. B. ATP. C. O2. D. glucose. E. NADP+.
Which of the following respiratory systems is not dependent on the animal's circulatory system to function efficiently?
A. vertebrate lungs B. fish gills C. tracheal systems in insects D. the skin of earthworms E. All of the systems noted here are closely associated with the circulatory system.