AP®︎ Biology: Topic 4.4 Practice Test
Prepare for your quiz, test, or the AP exam with focused practice questions on Topic 4.4 of AP Biology – Feedback.
Questions List
Topic 4.4
Question 1 Easy
This question tests the following: IST-3.G
What can happen if a signaling protein undergoes a mutation?
What You’re Being Tested On:
Explore the learning objectives taken directly from the College Board’s AP® Biology Curriculum. Ensure you’re prepared for the exact topics covered on the AP® exam, in-class tests, and quizzes, and gain confidence in your mastery of the material.
Topic 4.4: Feedback
Learning Objective: 4.4.A
Explain how positive and negative feedback helps maintain homeostasis.
Essential Knowledge: 4.4.A.1
Organisms use feedback mechanisms to maintain their internal environments in response to internal and external changes. i. Negative feedback mechanisms maintain homeostasis by reducing the initial stimulus to regulate physiological processes. If a system is perturbed or disrupted, negative feedback mechanisms return the system back to its target set point. These processes operate at the molecular, cellular, and organismal levels. ii. Positive feedback mechanisms amplify responses and processes in biological organisms. The variable initiating the response is moved further away from the initial set point. Amplification occurs when the stimulus is further intensified, which, in turn, initiates an additional response that produces system change. Illustrative examples: Blood sugar regulation by insulin/glucagon; Lactation in mammals; Onset of labor in childbirth; Ripening of fruit.
