Dark clay soils that show significant expansion and contraction due to wetting and drying are referred to as
A) mollisols.
B) vertisols.
C) spodosols.
D) andisols.
B
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In humans, the majority of a transcription unit is composed of ____
a. exons b. introns c. promoter regions d. start codons e. regulatory elements
Smooth muscle cells in the airways relax while those in the blood vessels contract in response to the hormone epinephrine. What would you expect to be different in these two types of cells exposed to epinephrine?
A. presence of epinephrine receptors B. exposure to epinephrine released by neighboring cells C. activation of protein kinases D. types of proteins expressed E. rate of metabolism
Fossil fuels
a. are renewable natural resources. b. may be commercially depleted within this century. c. can be utilized without any environmental degradation. d. are essentially pure carbon deposits. e. are a renewable resource.
A lamprey is a(n)
A) jawless fish. B) bony fish. C) invertebrate chordate. D) amphibian. E) cartilaginous fish.