The structure in Figure 41-1 that is specialized to receive stimuli and send signals to the cell body islabeled:a
1.
b. 4.
c. 5.
d. 6.
e. 7.
A
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What happens when a keystone species has been removed from a habitat?
a. a collapse in biodiversity b. a reduction in predator species c. an increase in predator species d. an increase in biodiversity
In 1999, researchers found that they could create hybrid embryos between two species of sea urchin that had been separated for 10 million years. By treating eggs to remove the jelly coat, the sperm of the other species was able to fertilize. What step of the fertilization process is normally blocked, preventing hybridization between these species?
A. Sperm penetration B. Membrane fusion C. Egg activation D. Nuclear fusion Clarify Question What is the key concept addressed by the question? What type of thinking is required? Gather Content What do you already know about fertilization? What other information is related to the question? Choose Answer Given what you now know, what information is most likely to produce the correct answer? Reflect on Process Did your problem-solving process lead you to the correct answer? If not, where did the process break down or lead you astray? How can you revise your approach to produce a more desirable result?
In the Hardy-Weinberg equation, the frequency of homozygous dominant individuals in a population is equal to
A) q or p. B) p2. C) 2pq. D) q2. E) 2p.
Adaptation to terrestrial life involved major evolutionary changes. The change from gill breathing to lung breathing was accompanied by important changes in the
A) reproductive system. B) cardiovascular system. C) manufacture of blood cells. D) association of blood and interstitial fluid.