21. This passage was most likely excerpted from
a diary kept by a practicing neurobehavioral researcher
a newspaper article on recent advances in the biochemistry of learning
a technical article on experimental techniques in the field of molecular biology
an article summarizing a series of scientific investigations in neurobehavioral research
a book review in a leading journal devoted to genetic research
22. The primary purpose of the passage is to show that extensive experimentation has
demonstrated the importance of amino-acid fragmentation in the induction of amnesia
cast doubt on the value of puromycin in the neurobehavioral investigation of learning
revealed the importance of amnesia in the neurobehavioral study of learning
not yet demonstrated the applicability of molecular biology to neurobehavioral research
not supported the hypothesis that learning is directly dependent on protein synthesis
23. According to the passage, neurobehaviorists initially based their belief that protein synthesis was related to learning on which of the following?
Traditional theories about learning
New techniques in protein synthesis
Previous discoveries in molecular biology
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