The circulating substances that affect the hypothalamus and initiate fever are ________.

A. lysozymes
B. leukotrines
C. complement
D. pyrogens
E. interferons


Answer: D

Biology & Microbiology

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Carriers that shed and transmit pathogens a long time after they have recovered from an infectious disease are called ________ carriers.

A. asymptomatic B. convalescent C. passive D. chronic E. incubation

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According to Figures 24.1 and 24.2, humans are members of the monophyletic (select all that apply):

What will be an ideal response?

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The ecological footprint of an average Egyptian is greater than that of an average American.

Answer the following statement true (T) or false (F)

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During which stage of meiosis do the sister chromatids separate?

a. metaphase I b. anaphase I c. metaphase II d. anaphase II e. telophase II

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