All of the following individuals were involved in improving public health in the 19th century EXCEPT
A. Snow.
B. Spallanzani.
C. Nightingale.
D. Semmelweis.
E. Lister.
Answer: B
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____ describes the process whereby a phagocyte, in response to cytokines secreted by dendritic (or other) cells, exits a blood vessel and moves into an infected region of tissue
Fill in the blank with the appropriate word.
Which of the following statements is false ?
a. Viruses contain DNA or RNA. b. The nucleic acid of a virus is surrounded by a protein coat. c. Viruses multiply inside living cells using viral mRNA, tRNA, and ribosomes. d. Viruses cause the synthesis of specialized infectious elements. e. Viruses multiply inside living cells.
Which factors are density-independent?
a) predation and competition b) competition and unusual weather c) parasitism and disease and natural disaster d) natural disaster and unusual weather
Which of the following statements is NOT a possible outcome of antigen-antibody reaction?
A) clonal deletion B) activation of complement C) opsonization D) ADCC E) agglutination