The different species of finches on the Galapagos Islands are believed to have arisen as a result of natural selection acting on populations of finches that had experienced
A. Convergent evolution
B. Gene flow
C. The bottleneck effect
D. Geographic isolation
E. hybrid sterility
Ans: D. Geographic isolation
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Represented by only two living genera, Psilotum and Tmesipteris, ____ resemble the extinct Cooksonia. Having no
true roots or leaves, these seedless vascular plants are essentially forking green stems.
a. mosses b. whisk ferns c. ferns d. club mosses e. horsetails
Which sensory modality responds to the broadest range of molecules?
A. TRP channels B. Taste C. Smell D. Vision E. Touch 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 sensory modalities? 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?
Which of the following would NOT be an action of the complement system?
a. lysis of a pathogen's membrane b. trapping of pathogens in tangled protein threads c. marking of pathogens for destruction by macrophages d. attraction of phagocytes to the scene of pathogen invasion e. membrane attack complexes
Once uterine contractions have begun, the female body releases several hormones that act in a positive feedback loop. The purpose of this feedback loop is ________.
A. to promote the development of a new follicle B. to ensure continued contractions until labor is complete C. inhibit the release of prostaglandins D. decrease the number of oxytocin receptors in the uterus