All animal cells lack a ________
Fill in the blank(s) with correct word
cell wall
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What critical role is often played by pigs in the epidemiology of influenza virus?
A. Pigs are the reservoir for influenza virus and most humans become infected by contact with respiratory secretions of pigs. B. Pigs are the reservoir for influenza viruses and disease can be transmitted to humans by consuming undercooked pork. C. Pigs harbor influenza viruses that are much more virulent than avian strains and human strains. D. Pigs can become infected simultaneously with both human, avian, and swine varieties of influenza viruses, providing an opportunity for genetic recombination resulting in antigenic drift.
A female exhibits two major approaches in choosing a mate, selecting either the phenotypic characteristics of the mate or the
A) number of other females the male has in his harem. B) ability of the male to provide resources. C) number of offspring the male has previously produced. D) age of the male.
Who developed the binomial system of nomenclature?
a. Charles Darwin b. Carolus Linnaeus c. Gregor Mendel d. Paul Hebert e. Ernst Haeckel
Blood flow through capillaries is controlled by
A) one-way valves. B) precapillary sphincters only. C) smooth muscle in the walls of arterioles only. D) precapillary sphincters and smooth muscle in the walls of arterioles.