The following factors may sometimes play a role in the movement of sap through xylem. Which one depends on the direct expenditure of ATP by the plant?
A) capillarity movement of water within the xylem
B) evaporation of water from leaves
C) cohesion among water molecules
D) concentration of ions in the symplast
E) bulk flow of water in the root apoplast
Answer: D
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A. They are superantigens. B. They kill neutrophils. C. They make holes in host cell membranes. D. They bind to Fc regions of antibodies.
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A. ecosystem. B. biosphere. C. community. D. entity. E. biosystem.
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