During operant conditioning, an animal learns to
A) perform a behavior to receive a reward or avoid punishment.
B) perform a response to a new stimulus.
C) change an imprinted behavior.
D) behave like a different animal.
E) imprint upon an inappropriate object.
A
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Identical twins arise from a split at which stage?
a. the morula b. the blastula c. two cells d. eight cells e. 32 cells
Reconstructions of the evolutionary relationships of a set of taxa are called
A) classifications. B) phylogenetic trees. C) UPGMA networks. D) networks. E) evolutionary scenarios.
Which of the following is an accurate description of climate patterns that result from supercontinent cycles?
A. Climate is generally cooler and drier at the margins of supercontinents compared to the interior. B. During the Mesozoic, Gondwana passed over the South Pole and experienced extensive glaciation. C. Temperature extremes were common in the interior of Pangaea at end-Permian due to its massive size. D. Supercontinental breakup can cause global warming, suggested by the breakup of Rodinia at the end of the Proterozoic.
Normally, a certain enzyme has maximum activity at 37°C, but once it has been heated to 100°C and then cooled back down to 37°C, the enzyme is no longer active. Why?
What will be an ideal response?