In the Neurotransplantation Experiment by Ralph and Colleagues,the Suprachiasmatic Nuclei

question 56

Multiple Choice

In the neurotransplantation experiment by Ralph and colleagues,the suprachiasmatic nuclei (SCN) were transplanted from the fetuses of mutant hamsters that had abnormally brief free-running sleep-wake cycles into normal adult hamsters whose sleep-wake cycles had been abolished by SCN lesions.The transplants initiated __________ sleep-wake cycles in the recipients.

• A) 24-hour
• B) 24-hour free-running
• C) 25.5-hour free-running
• D) 20-hour free-running
• E) reversed

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