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

question 123

Multiple Choice

In the neurotransplantation experiment by Ralph and his colleagues, the suprachiasmatic nuclei (SCN) were transplanted from the fetuses of mutant hamsters 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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Definitions:

Social Behavior

Actions within a society that are carried out by individuals and are influenced by the presence and behavior of others.

Revolution

The overthrow of a state or the total transformation of central state institutions.

Social Movement

A group that acts with some continuity and organization to promote or resist social change in society.

Demographic Processes

The dynamic changes in population size and structure, influenced by birth rates, death rates, immigration, and emigration.