Which of the following processes is not involved in allopatric speciation?
a. genetic drift c. natural selection
b. mutation d. migration
D
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Prokaryotic cells lack
(a) DNA. (b) a true nucleus. (c) a cell wall. (d) none of the above.
According to the first law of thermodynamics,
a. matter can be created and destroyed. b. matter only changes forms. c. energy can be created and destroyed. d. energy only changes forms. e. matter and energy can be interconverted.
At rest, the partial pressure of oxygen (PO2) is most veins is approx. 40 mm Hg. At this PO2, approx. ______ of hemoglobin molecules are associated with oxygen.
A. 25% B. 40% C. 50% D. 75%
Growth that results in an increase in stem or root length occurs in which specific area of the plant?
a. lateral meristem b. apical meristem c. vascular cambium d. cork cambium e. periderm