Which statement about the domain Archaea is true?
A) Genetic prospecting has recently revealed the existence of many previously unknown archaean species.
B) The genomes of archaeans are unique, containing no genes that originated within bacteria.
C) No archaeans can inhabit solutions that are nearly 30% salt.
D) No archaeans are adapted to waters with temperatures above the boiling point.
A
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The five different taste qualities are each located in a separate region of the tongue.
a. true b. false
Darwin studied and wrote extensively about the mechanism known as artificial selection. Artificial selection is similar to natural selection, except that ________
A) natural selection works toward a specific goal B) artificial selection relies on preexisting variations in populations; natural selection does not C) artificial selection produces varieties that would be less likely be favored in nature D) artificial selection produces varieties of less interest to humans than natural selection
In a polyandrous mating system:
a. multiple males tend to mate with the same female. b. sexual monomorphism is expected. c. male-male competition is common. d. multiple females tend to mate with the same male. e. males tend to compete for access to females.
The function of the sphincter between the stomach and small intestine is to
A) retain chyme in the stomach until pepsin digestion is complete. B) periodically release chyme into the small intestine in squirts. C) release bile into the duodenum when chyme is present. D) release pancreatic secretions into the duodenum when chyme is present.