Based on the graph above, the color of male guppies can be seen as a balance between positive and negative selections. Bright colors are an advantage in ________, but a disadvantage in ________.
A. attracting mates; avoiding predators
B. avoiding predators; attracting mates
C. attracting mates; finding food
D. finding food; attracting mates
E. avoiding predators; finding food
Answer: A
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Blood returning to the mammalian heart in a pulmonary vein will drain first into the
A. vena cava. B. left atrium. C. right atrium. D. left ventricle. E. right ventricle.
Which of the following is a disadvantage of using corn to manufacture ethanol as a fuel additive?
A. Ethanol contains far less energy than other fuels. B. Ethanol absorbs water and would thus corrode fuel pipelines used in transport. C. Use of corn as a fuel source drives up the cost of grain worldwide. D. All of these are disadvantages.
Which of the following events is unique to prophase I of meiosis?
a. Chromosome condensation. b. Nuclear membrane breakdown, c. Pairing of homologous chromosomes. d. Assembly of a spindle apparatus.
When leaf cells lose so much water that turgor pressure falls, the plant:
A. wilts B. closes up the protein channels through which water is lost C. takes in water from air D. dies E. starts to grow