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According to the passage, neuron behaviorists initially based their belief that protein synthesis was related to learning on which of the following?

Answer:

1. Specific research into learning on which of the following
2. Traditional theories about learning
3. Historic experiments on the effects puromycin
4. Previous discoveries in molecular biology
5. Now technique in protein synthesis.

Answer: D

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The primary purpose a the passage is to show that extensive experimentation hasIt can be inferred from the passage that after puromycin was perceived to be a disappointment, researches did which of the following?