What is the natural function of restriction endonucleases?
a. research applications
b. DNA manipulation in vitro
c. defense against viruses that infect bacteria
d. regulating bacterial gene expression
e. breaking phosphodiester bonds in mammalian DNA
C
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Glucocorticoids
a. are secreted by the adrenal cortex. b. influence carbohydrate, fat, and protein metabolism. c. function during times of infection, injury, and anxiety as part of the stress response. d. are exemplified by cortisol. e. fit all of these descriptions.
Outgroup analysis looks for features that are shared derived characters in a given group of organisms. Indicate whether the statement is true or false
During the 1980s, wolves were reintroduced to Yellowstone National Park after decades of absence due to attempted extermination in the early part of the twentieth century
Within 20 years, not only had the wolf population increased, but there was also a dramatic increase in other species, such as aspen, cottonwood, and willow trees, beavers, warblers, insects, and fish. These changes in Yellowstone Park are examples of how important a(n) ________ can be to an ecosystem. A) keystone species B) competitor C) herbivore D) parasite
What is the tendency of water molecules to stick together?
A) cohesion B) adhesion C) tension D) transpiration