AP Bio Insta-Review Topic 4.5: Feedback

Front

What is feedback in biological systems?

Back

Feedback refers to the process by which a system regulates itself by using the output of a process to control its input, maintaining homeostasis.

Front

What is negative feedback?

Back

Negative feedback is a mechanism that counteracts a change in a system, promoting stability by returning the system to its set point.

Front

What is positive feedback?

Back

Positive feedback is a mechanism that amplifies a change in a system, moving it away from its set point.

Front

What is homeostasis?

Back

Homeostasis is the process by which biological systems maintain a stable internal environment despite external changes.

Front

What is the lac operon?

Back

The lac operon is a set of genes in bacteria that are involved in the metabolism of lactose, regulated by the presence or absence of lactose.

Front

How does the lac operon demonstrate negative feedback?

Back

The lac operon is only activated in the presence of lactose, preventing unnecessary production of enzymes when lactose is absent.

Front

What is a feedback loop?

Back

A feedback loop is a cycle in which the output of a system influences its own input, often used to maintain homeostasis.

Front

What role does insulin play in blood glucose regulation?

Back

Insulin helps lower blood glucose levels by facilitating the uptake of glucose into cells when blood sugar levels are high.

Front

How does the trp operon function?

Back

The trp operon is active only when tryptophan is absent, preventing the synthesis of tryptophan when it is already available.

Front

What is an example of negative feedback in temperature regulation?

Back

When body temperature rises, mechanisms such as sweating are activated to cool the body down, returning it to a normal temperature.