Simple compounds are built up and used to manufacture cellular materials in the process of ________.
A. catabolism
B. positive feedback
C. anabolism
D. negative feedback
Answer: C
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A vaccine against HIV
A) is available for those who can afford it. B) may be impossible due to the variability and diversity of HIV. C) prevents opportunistic infections. D) consists of cocktails of drugs taken daily.
Which chemical induces prolonged contraction of smooth muscle during allergic reactions?
a. basophil chemotactic factor b. eosinophil chemotactic factor c. histamine d. SRS-A e. TP-2
A vein responsible for draining blood from the upper limb is the
A. azygos vein. B. portal vein. C. cephalic vein. D. peroneal vein. E. common iliac vein.
How does keratin in skin help defend the body?
A. It traps microbes. B. It is a tough protein that bacteria cannot easily break through. C. It forms an acid mantle which bacteria do not like. D. None of these answers are correct.