Bistability in a Biological System Can Be Accompanied by Hysteresis

question 72

Multiple Choice

Bistability in a biological system can be accompanied by hysteresis. Consider switchlike cellular responses to a signal molecule, as shown in the following graphs. In each graph, the solid curve corresponds to the change in cellular response when the signal concentration is being increased over time, whereas the dashed curve corresponds to the change when the signal concentration is being decreased. Which graph do you think corresponds to a system with a greater degree of hysteresis? What mechanism is responsible for this behavior?

• A) Graph A; negative feedback
• B) Graph A; positive feedback
• C) Graph B; negative feedback
• D) Graph B; positive feedback

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Definitions:

Charles Finney

A leader in the Second Great Awakening in the United States, known for his role in the development of modern revivalist evangelism.

Religious Reformer

An individual who seeks to bring about change within a religious institution or practices, often advocating for modernization, moral improvement, or a return to foundational principles.

Second Great Awakening

A period of religious revival in the United States that began in the late 18th century and continued into the early 19th century, characterized by widespread revivals and a strong sense of social justice and reform.

Social Reform

The process of enacting measures and changes in society with the intention of improving conditions and correcting injustices, often focusing on issues like poverty, education, and public health.