One portion of the cell theory states that ____
a. all cells have a nucleus
b. all cells divide by meiosis
c. all living organisms are made up of one or more cells
d. cells arise through spontaneous generation
e. growth is solely the result of cell division
c
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A pollination syndrome is
A. the synchronous release of pollen by many individuals of wind-pollinated trees. B. specializations of plants that attract a specific kind of pollinator. C. the simultaneous release of two sperm, one to affect fertilization and the other to initiate formation of endosperm. D. a brushlike tongue of hummingbirds to which pollen adheres. E. a series of bristles on the backs of insects to which pollen adheres.
Which of these are produced directly by meiosis in pine?
a. sperm cells. b. pollen grains. c. microspores. d. microspore mother cells.
With increasing forest area in a patch, what is more likely to occur?
A) interior species B) edge species C) boundary species D) area-insensitive species
How does crossing over increase genetic diversity?
A) Crossing over increases the different combinations of genes present in a gamete. B) Crossing over allows specific genes to travel together on one chromosome. C) Crossing over increases the incidence of mutations in genes. D) Crossing over prevents the inheritance of harmful mutations.