What is an evolutionary adaptation of an existing structure for a completely new purpose (e.g., feathers for insulation or for flight)?
a. exaptation
b. key innovation
c. coevolution
d. adaptive radiation
e. microevolution
a
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As the first steps in creating recombinant DNA molecules were taking place, scientists immediately realized that
modifying the genetic information in ____________________, a bacterium from the human gut, could be potentially dangerous. Fill in the blank(s) with the appropriate word(s).
_____________________ can be defined as compulsive and repetitive behavior which can lead to impairment. Fill in the blank(s) with the appropriate word(s)
Refer to Figure 48-3. Reabsorption of water occurs at the points labeled:
a. 3 and 9.
b. 5 and 8.
c. 6 and 10.
d. 8 and 10.
e. only 10.
Kinases and phosphatases are essential in the cell because they directly
A) turn proteins "on and off" through changes in phosphorylation status. B) bind hydrophobic hormones in the cytoplasm. C) bind and release calcium ions. D) destroy IP3, turning off that signaling pathway. E) activate and repress genes.