About __________ of the total energy the sun releases strikes the atmosphere
a. one-tenth
b. one-hundredth
c. one-thousandth
d. one-millionth
e. one-billionth
e
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Energy captured during the "photo" part of photosynthesis is stored ________________ during the "synthesis" part of the process
A. as high energy electrons B. in carbon atoms C. in covalent bonds D. a and c E. b and c
A person suffers a stroke. A blood clot reduced blood flow in the brain. The person is unable to say
words, but is able to read and understand text. Which of the following best explains this person's problem?
a. The cortex of the cerebellum was affected by the reduced blood flow. b. The interruption in blood flow affected the corpus callosum. c. The region of damage was responsible for integration of visual and auditory stimuli. d. The reduced blood flow damaged Wernicke's area of the temporal lobe. e. The reduced blood flow damaged Broca's area of the temporal lobe.
Which of the following is a possible advantage for the environment of having farmers use plants that genetically produce Bt toxin?
A) Plants with genes for the toxin are eaten less often by insects, and therefore less insecticide is needed. B) Plants that produce Bt toxin must be grown from new seeds each season, and therefore fewer of them are planted. C) Bt toxin is advantageous to many species of invertebrates that grow in the same fields. D) Harvesting plants with these genes is less disturbing to the soil layers where they are planted. E) Plants with these genes must be sprayed with the organism, but need much less than other plants.
Two populations of birds with somewhat different coloration live on opposite sides of a peninsula. The habitat between the populations is not suitable for these birds. When birds from the two populations are brought together, they produce young whose appearance is intermediate between the two parents. These offspring will breed with each other or with birds from either parent population, and all offspring of these pairings appear intermediate to various degrees. What keeps the two populations separate?
A. lack of hybrid viability B. behavioral reproductive isolation C. temporal reproductive isolation D. habitat isolation