Ghrelin is
a. a drug used to control weight gain.
b. a signaling molecule released by the
adipose cells to stimulate appetite.
c. a signaling molecule released by cells in the
stomach and brain to stimulate appetite.
d. a hormone found only in mice that is used
to study weight loss.
e. none of these
C
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You are a biologist on a trip to an island in the South Pacific. While there, you are allowed to collect DNA samples from a local species of tortoise that resembles a species seen on a nearby continent
If your DNA analysis also indicates the two species are highly related, you might conclude that this was an example of _______________ through ________. A. allopatric speciation; dispersal B. allopatric speciation; vicariance C. sympatric speciation; dispersal D. sympatric speciation; vicariance
Soft-shelled turtles can remain submerged underwater for several hours without ventilating their lungs because ______.
A. they can use cutaneous respiration through the soft lining of their throats B. the partial pressure of O2 is higher underwater C. they can store some air in special air sacs under the shell D. they also have rudimentary gills
Four of the five animals listed below possess a
complete digestive system. Select the exception. a. human b. bird c. earthworm d. planaria e. fish
In the absence of repair, what would the replication of a double helix containing a mismatch yield?
A. two DNA molecules containing different mismatches at the site of the original error B. two DNA molecules with a mutated sequence C. one DNA molecule with the normal sequence and one DNA molecule with a mutated sequence D. two DNA molecules containing the mismatch E. one DNA molecule with the normal sequence and one DNA molecule with a mismatch