The figure below shows how differential centrifugation can be used to isolate four subcellular fractions.Which fraction corresponds to the membrane fraction? 
Definitions:
Power Elite Theory
A theory that suggests that societies are ruled by a small group of individuals who have a disproportionate amount of wealth, privilege, and access to decision-making power.
American Society
A social structure within the United States characterized by diverse cultures, values, and institutions.
Intrinsic Religiosity
A personal commitment to religious beliefs and practices that are deeply internalized and influence one's life and behavior.
Unofficial Requirement
An expectation or condition that is not formally articulated but is understood and followed in practice.
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