Which is mismatched?
A. prostaglandins - activate eosinophils and B-cells
B. serotonin - causes smooth muscle contraction
C. interferon alpha and beta - inhibits viral replication
D. interleukin-2 - stimulates T-cell mitosis and B-cell antibody production
E. tumor necrosis factor - increases chemotaxis and phagocytosis
Answer: A
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Persistent viruses that can reactivate periodically are ________.
A. syncytia B. chronic latent viruses C. inclusion bodies D. cytopathic E. oncoviruses
Among other bones, the axial skeleton includes the ________.
a) thoracic cage and vertebral column b) thoracic cage and pectoral girdle c) skull and pelvic girdle d) pectoral and pelvic girdles
There are millions of species of organisms living at this time and new species are still being discovered. Based on Darwin's theory of evolution, which of the following best describes how millions of species have developed?
A. Organisms passed on acquired characteristics to evolve from lower life forms to higher life forms. B. Organisms were selectively bred to create different species. C. Completely different species crossed with one another to form the many different organisms. D. Different genetic variations in organisms were selected in different environments.
What keeps the trachea from collapsing?
A) Cilia B) Surface tension of water C) Surfactant D) Semicircular rings of cartilage