Which is NOT a function of the cytoskeleton?
a) maintains a cell's shape
b) allows cells to move
c) allows transport within a cell
d) secretes the calcium for bone tissue
Ans: d) secretes the calcium for bone tissue
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Cavitation can occur when what happens?
A. Root pressure pushes water up the xylem. B. Stomata get stuck closed. C. Clouds block sunlight shining on the leaves. D. Gas bubbles expand inside a tracheid or vessel member. E. Starch grains block the sieve tubes.
In which stage of labor dose the amniotic sac rupture?
a. the first stage b. the second stage c. the third stage d. in either the first or second stage e. in either the second or third stage
When a researcher transplanted the nucleus of an intestinal cell from a tadpole into an egg cell whose nucleus had been destroyed, the egg developed into a normal frog. This illustrates that
A) genes are gained during the process of differentiation. B) a nucleus that is removed from its normal location is influenced by adjoining cells. C) each cell of an organism has all the genes needed for development. D) the homeobox genes in a transplanted nucleus undergo mutation. E) scientists can clone a human by putting one of his or her nuclei into an egg cell.
Bioremediation is:
A. the use of microorganisms to treat open wounds B. the use of bacteria to attack cancer cells C. the use of bacteria in the production of biofuels D. the use of microorganisms to attack pathogenic bacteria E. the use of microorganisms to break down harmful substances in the environment