Why might rare species of plants be particularly valuable for discovering new medical treatments?
A. They are less likely to have been well-studied already.
B. Plants with high levels of secondary metabolites are less likely to have large, successful populations.
C. Only plants having trouble competing would waste energy on producing bioactive compounds.
D. Rare plants are not valuable for medical treatments, but it is an effective way to get people to preserve biodiversity.
A. They are less likely to have been well-studied already.
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What will be an ideal response?
Precursor-mRNA (pre-mRNA) typically exists
a. only in prokaryotes. b. in both the nucleus and cytoplasm of eukaryotes. c. only in the cytoplasm of eukaryotes. d. in both prokaryotes and eukaryotes. e. only in the nucleus of eukaryotes.
Four of the five answers listed below are characteristic of hyperthyroidism. Select the exception
a. excessive weight loss b. excessive water loss through urination c. intolerance of heat d. increased heart rate and blood pressure e. excessive sweating
During what period did one of the greatest extinctions of mammals occur?
A) Cretaceous B) Permian C) Pleistocene D) Carboniferous