Biology review tool week 3

What is a negative feedback loop?

• A process in which the body senses a change and activates mechanisms to accelerate that change.
• A process in which the body senses a change and activates mechanisms to reverse that change.
• A process in which the body ignores a change and does not activate any mechanisms.
• A process in which the body senses a change and activates mechanisms to maintain that change.

What is a positive feedback loop?

• A process that decreases the output, leading to stunted growth or development.
• A process that has no impact on the output.
• A process that only occurs in negative situations.
• A process that amplifies or increases the output, leading to further growth or development.

What does a ligand do?

• Breaks down a receptor
• Has no effect on a receptor
• Causes a receptor to multiply
• Binds to a receptor

What is the role of a receptor in a cell?

• To produce energy for the cell

• To control the movement of substances in and out of the cell

• To bind to specific molecules, triggering a response in the cell

• To provide structural support to the cell

What is homeostasis?

• The process of cell division

• The process of energy production in a cell

• The process of maintaining a stable internal environment in an organism

• The process of growth and development in an organism

What is the effect of a positive feedback loop on homeostasis?

• It disrupts homeostasis and causes instability

• It has no effect on homeostasis

• It helps maintain homeostasis by reversing any changes

• It helps maintain homeostasis by amplifying the changes

What is one reason a positive feedback loop would be used in the body?

• To maintain homeostasis
• To decrease the response to a stimulus
• To amplify or increase the response to a stimulus
• To prevent any response to a stimulus