Branches of a phylogenetic tree are organized by which principle?
a. morphology
b. geographic proximity
c. genetic relationships
d. sapidity
c. genetic relationships
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The KN-1 gene in maize is normally expressed
a. in primary meristems, where it initiates the process of differentiation. b. in apical meristems, where it maintains the undifferentiated state. c. in apical meristems, where it initiates the process of differentiation. d. in primary meristems, where it maintains the undifferentiated state. e. in lateral meristems, where it initiates the process of secondary growth.
Commercial fertilizer labels prominently display three numbers, which indicate the content of three elements needed by most plants as macronutrients. These elements in number sequence are
A. zinc, magnesium, and potassium. B. carbon, sulfur, and nitrogen. C. nitrogen, zinc, and copper. D. nitrogen, phosphorus, and potassium. E. copper, nitrogen, and phosphorus.
Viral infection is a major cause of cancer
a. True b. False
To maintain guard cell turgor, which of the following must occur?
A. Potassium ions are pumped out. B. Energy is constantly expended. C. Water exits by osmosis. D. Stomata take up oxygen. E. Transpiration occurs.