Enzymes used to insert a foreign gene into a plasmid include
(a) DNA ligase.
(b) vectors.
(c) restriction enzymes.
(d) both a and c.
(d) both a and c.
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Electron microscopy is useful for counting viruses and distinguishing between infective and non-infective virions
Indicate whether this statement is true or false.
Which of the following statements concerning
subordinate behavior as exemplified by interactions among members of wolf packs is true? a. It is gradually being removed by natural selection. b. It is adaptive. c. It is self-sacrificing. d. It is inexplicable in terms of reproductive success. e. Subordinate status is permanent.
The dengue and Ebola viruses cause hemorrhagic fevers. Evaluate their threat levels as select agents using the criteria in the textbook, and decide whether they pose significant risk as biological weapons.
What will be an ideal response?
Most of the ocean's productivity occurs ____.
A. in the open ocean B. in the intertidal zone C. in the pelagic province D. near hydrothermal vents E. in the benthic province