The smallest unit that has all of the characteristics of life is the
(a). cell.
(b). tissue.
(c). organ.
(d). organ system.
(e). organism.
(a). Cell.
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If you were to penetrate through the epidermal layer
of a root, you would next encounter the a. xylem. b. endodermis. c. cortex. d. phloem. e. pericycle.
In the process known as ____, the fate of a cell is influenced by interactions with neighboring cells
a. determination b. induction c. apoptosis d. differentiation e. tumor suppression
Which of the following correctly shows a possible order of events resulting in allopatric speciation?
A. postzygotic reproductive isolation - geographic isolation - natural selection B. geographic isolation - prezygotic reproductive isolation - genetic drift C. geographic isolation - natural selection - prezygotic reproductive isolation D. natural selection - postzygotic reproductive isolation - geographic isolation E. natural selection - prezygotic reproductive isolation - postzygotic reproductive isolation
In pea plants, the allele for purple flowers (P) is dominant to the allele for white flowers (p). In a cross between a purple-flowered plant and a white-flowered plant, all 73 of the offspring plants had purple flowers
Which cross would provide such results? A) pp × pp B) Pp × Pp C) PP × PP D) PP × pp