In the neurotransplantation experiment by Ralph and colleagues, ...

[khang]

In the neurotransplantatio n 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

Question 2

There is good evidence that the internal circadian clock is located in the
 
  A) suprachiasmatic nuclei.
  B) raph nuclei.
  D). basal forebrain.
  E) optic nerves.C) caudal reticular formation.

[LP]

Answer to Question 1

Answer: D

Answer to Question 2

Answer: A