Membrane phospholipids
A) have hydrophobic heads that face the center of the membrane and are shielded from water.
B) have hydrophilic tails that face outward and are exposed to water.
C) are able to drift about in the plasma membrane.
D) remain fluid because they are tightly packed against one another.
Answer: C
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Examine the figure above. In the continental U.S., the dark green patches show areas with the highest bird species richness. What best explains why these areas have such diversity?
A. These areas have the highest temperatures in the continental U.S.
B. These areas have mountainous terrain.
C. These areas have well-protected natural areas.
D. These areas have low frequencies of extreme weather events and fire.
Which of the following is a characteristic of facilitated diffusion (passive transport) of a molecule across a membrane?
A) Its rate is higher than that of simple diffusion of the molecule. B) It is highly specific for the molecule being transported. C) The direction of transport is determined by concentration and/or electrochemical gradients. D) The rate of transport is saturable. E) All of the above are true.
Communication between animals is
A. usually primarily instinctive. B. common between different species. C. primarily a learned activity. D. rare.
Which of the following is not a part of the process of translation?
A. initiator tRNA binding to the ribosome B. removal of introns from mRNA C. mRNA binding to the ribosome D. joining large and small ribosomal subunits E. chain termination at a stop codon