Explain how the structures of tracheids and vessel elements are specialized for their conduction of water and dissolved
minerals. What will be an ideal response?
Concepts to Consider: Both cells are dead and hollow, so water can be conducted through
them. Tracheids--tapered cells found in patches; have pits in cell walls that pass water from
cell to cell. Vessel elements--stacked on top of one another like a pipe; perforations in end
walls and pits in lateral walls pass water from vessel element to vessel element.
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Scientists have learned the full extent of viral abundance on earth because
A. a wide variety of microbes is available to act as hosts for these viruses. B. metagenomic sequencing has identified viruses in a broad variety of environments. C. the final step of the viral life cycle, release of mature viruses and cell lysis, releases millions of viruses. D. viruses are known to grow on all life forms: animal, plant, fungi, and bacteria.
A Pasteur flask has a(n)
A) swan neck to prevent particulate matter from getting into the main body of the flask. B) double neck so two substances may be added at the same time. C) secondary opening at the base to allow for drainage. D) inverted upper edge to prevent spillage while swirling.
A keystone species
a. has a disproportionately large effect on a community relative to its abundance b. controls the prey species. c. may increase or decrease the number of prey species in a community. d. has a disproportionately large effect on a community relative to its abundance, and may increase or decrease the number of prey species in a community. e. has a disproportionately large effect on a community relative to its abundance, controls the prey species, and may increase or decrease the number of prey species in a community.
Bacteria that live around _________obtain energy by oxidizing inorganic hydrogen sulfide.
Fill in the blank(s) with the appropriate word(s).