Growth factors work as signaling molecules. When they bind to receptors on target cells, they function to
A. activate proto-oncogenes, halting cell division.
B. inactivate proto-oncogenes, stimulating cell division.
C. inactivate proto-oncogenes, halting cell division.
D. activate proto-oncogenes, stimulating cell division.
Answer: D
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Sympathetic effects include
a. decreased heart rate. b. decreased salivation. c. narrowing of pupils. d. constriction of the airways. e. none of these
Gas exchange in terrestrial insects is accomplished through:a
the use of gills. b. the use of tracheae. c. the use of book lungs. d. a closed circulatory system. e. diffusion across the epidermal layer.
When you cut yourself, the damaged cells immediately release chemical alarm signals, such as
A) interferon. B) complement. C) histamine. D) antihistamine.
The single atom you would choose to remove from living organisms in order to remove the highest percentage of atoms would be.
A. oxygen B. nitrogen C. carbon D. hydrogen