A pyrimidine or purine base that has been joined with a ribose or deoxyribose sugar moiety is now termed a ________.
Fill in the blank(s) with the appropriate word(s).
nucleoside
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What does the graph in the figure above tell you about the definition of a keystone species?
A) A keystone species has little interaction with other species in an environment. B) Removing a keystone species from the community drastically reduces diversity. C) Adding a keystone species to the community will make it more diverse. D) Removing a keystone species from the community will eventually allow for the invasion of a new species.
Many dinosaur movies depict huge tree-like plants growing out of swamps. To what group would these "trees" likely belong? Select all correct choices
A. lycophytes B. cycads C. angiosperms D. bryophytes
The source region in the pressure flow theory of phloem transport is most often the:
a. root b. flower c. stem d. leaf e. soil
What are the two major components of the Tobacco Mosaic Virus?
A) RNA and DNA B) carbohydrates and nucleic acids C) DNA and protein D) RNA and protein E) lipids and nucleic acids