In ________ immunity, an individual makes their own antibodies in response to antigen exposure, whereas in ________ immunity, an individual receives antibodies made by another individual(s).
A. passive; active
B. natural; artificial
C. active; passive
D. natural; active
E. artificial; active
Answer: C
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The water strider shown in the figure above is able to stand on water because of the ____ of water
a. covalent bonds b. surface tension c. van der Waals forces d. density e. hydration layer
What agricultural practice encourages the rapid
spread of plant diseases?
a. irrigation practices b. use of herbicide sprays c. genetic modification of crops d. planting large areas with a single variety e. use of pesticides
Which of the following is NOT true of ecosystems?
a. Although they may include many different species, many features of ecosystem structure and function are alike. b. Autotrophs secure energy and nutrients that are then used by heterotrophs. c. Energy cycles and minerals flow through ecosystems. d. Many different food chains are represented in most ecosystems. e. Ecosystems are characterized by relatively few trophic levels
One of the findings of the human genome project is that humans vary by
a. introns. b. exons. c. SNPs. d. codons. e. deviant bases.