The primary cause of desertification in the world today is
a. increased salinity resulting from irrigation practices.
b. overgrazing of marginal lands.
c. clearing and degradation of tropical forests.
d. herbicide and fertilizer runoff.
e. use of water for industry.
B
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In the recognition of foreign microbial pathogens by host cell phagocytes, which of the following are found on the pathogen rather than on or in the phagocyte?
A. Pattern recognition molecules B. Toll-like receptors C. MAMPs D. NOD receptors
How could a biologist distinguish an acoel flatworm from a free living platyhelminth?
A. The acoel worm would be solid throughout, since it lacks a gut. B. The acoel worm would have a nervous system. C. The platyhelminth would have a more primitive gut and nervous system. D. Only the acoel is triploblastic. 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 acoel flatworms? Choose Answer · Given what you now know, what information and/or problem solving approach 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 is the best explanation for why vegetable oil is a liquid at room temperature while animal fats are solid?
A) Vegetable oil has more double bonds than animal fats. B) Vegetable oil has fewer double bonds than animal fats. C) Animal fats have no amphipathic character. D) Vegetable oil has longer fatty-acid tails than animal fats have.
The first hominin species associated with the use of tools was
A) Australopithecus robustus. B) Homo erectus. C) Homo habilis. D) Australopithecus afarensis. E) Homo sapiens.