The notion that the genetic code is universal suggests a common ancestor for all living organisms Indicate whether the statement is true or false
True
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The xylem is made from ________.
A. intercellular spaces between cells B. tubular living cells C. dead, hollow cells D. elongated living cells
Experiments on competition among species within a community reveal that
A) removing a group of species has relatively little effect on a community. B) removing a single species has a stronger effect than removing a group of species from a community. C) removing a group of species has a stronger effect than removing a single species from a community. D) removing a single species has relatively little effect on a community.
In a plant's sexual life cycle _____
A) sporophytes produce gametes by meiosis B) gametophytes produce gametes by mitosis C) gametophytes produce gametes by meiosis D) sporophytes produce gametes by mitosis
Carbon dioxide crosses the plasma membrane by simple diffusion. The rate at which carbon dioxide enters the cell is determined by the
A) amount of energy being produced by the cell. B) amount of transport protein in the membrane. C) concentration of carbon dioxide on each side of the membrane. D) amount of oxygen being exported from the cell. E) amount of carbon dioxide outside of the cell.