Ras is like a G protein because it:
A. triggers the formation of cyclic AMP.
B. responds to the activation of G
protein-coupled receptors.
C. is only active when it binds GTP.
D. All of these answer options are correct.
C
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The figure below illustrates one possible
__________ structure of __________. a. primary; proteins b. primary; carbohydrates c. primary; lipids d. secondary; proteins e. tertiary; proteins
Nuclear DNA is less stable and mutates faster than mitochondrial DNA.
a. true b. false
Rabid animals typically salivate excessively in the late stages of the disease. This excess salivation
A. provides a portal of exit for the virus. B. indicates that the salivary glands are the portal of entry. C. is the result of hydrophobia. D. helps reduce and control the fever.
In a hypothetical situation, a certain species of flea feeds only on pronghorn antelopes. In rangelands of the western United States, pronghorns and cattle often associate with one another. If it should happen that some of these fleas develop a strong preference, instead, for cattle blood and mate only with fleas that, likewise, prefer cattle blood, it is possible that over time ________ will occur.
1. reproductive isolation 2. sympatric speciation 3. habitat isolation 4. prezygotic barriers 5. cladogenesis A) 1 only B) 2 and 3 C) 1, 2, and 3 D) 1, 2, 3, and 5 E) 1 through 5