Movement of charged molecules in an electrical field, which is used to separate nucleic acid fragments for recombinant DNA work, is called ________.
A. nucleophoresis
B. electrophoresis
C. iontophoresis
D. plasmaphoresis
Answer: B
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Caterpillars of the same species on a large leaf each chew as much leaf as they can. This is an example of
A. amensalism. B. interference competition. C. exploitation competition. D. commensalism. E. interspecific competition.
What invertebrate group is most closely related to chordates?
1.Arthropods
2.Cnidarians
3.Echinoderms
4.Molluscs
Which hormone is used to promote ripening of fruit that has been picked green?
1.auxins 2.cytokinins 3.ethylene 4.gibberellins
Assigning economic value to individual species raises awareness of the need to conserve biodiversity. Often, however, the assignment of economic value fails to address the issue of conserving biodiversity in a general sense. Why?
A) Assigning economic values to species is difficult in general. B) We know nothing of the economic value of many potentially valuable species. C) Assigning values to species of necessity favors some species over others. D) All of the above are correct.