Which of these actions will reduce the rate of diffusion?
a. increasing the temperature
b. increasing membrane surface area
c. increasing membrane thickness
d. increasing the concentration gradient
c. increasing membrane thickness
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All of the following are functions of proteins embedded in the plasma membrane EXCEPT ____
a. transport of substances in and out of the cell b. generation of ATP c. recognition of signal molecules d. adherence to molecules on the surface of other cells e. recognition of "like" cells
How is brain growth in humans different from other mammals?
A. In humans brain growth continues after birth. B. In humans brain growth is complete by the third trimester. C. In humans brain growth stops at birth. D. Human growth is not allometric. E. Only humans develop a cerebrum.
California tarweed seeds were able to reach the Hawaiian Islands, and a new species emerged from this isolated population. What concept applies to this example?
A) the founder effect B) hybridization C) punctuated equilibrium D) polyploidy
What force is responsible for the cohesiveness of water?
A) osmosis B) hydrogen bonding between water molecules C) negative pressure created by evaporation D) ionic bonding