Ch 8: AP Biology: Requirements of Biological Systems

About This Chapter

Watch online science video lessons and learn about free energy, dynamic homeostasis, feedback systems and more. These lessons are just a portion of our AP Biology exam prep course.

AP Biology: Requirements of Biological Systems - Chapter Summary and Learning Objectives

Let our instructors walk you through the basic requirements of biological systems. Video lessons and quizzes can help you explore some of the cellular functions that allow organisms to grow and reproduce, from the conversion of the sun's rays into chemical energy to the process of decay that allows matter to be reused by living organisms. By the end of this chapter, you should be able to:

  • Explain cycles of energy capture and exchange
  • Identify methods by which cells regulate their internal environments
  • Describe the role of feedback mechanisms in maintaining homeostasis

Video Objectives
Living Systems Requirement for Free Energy and Matter Explain why free energy and matter are essential to the growth of living systems. Learn how this energy is captured, stored and exchanged.
The Environmental Requirements for Growth, Reproduction & Dynamic Homeostasis Describe how growth, reproduction and homeostasis require that cells create and maintain internal environments. Find out how cell membranes maintain homeostasis through the active and passive transport of molecules in and out of the cell.
Using Feedback Systems to Regulate Growth, Reproduction & Dynamic Homeostasis Explore how organisms use positive and negative feedback systems to regulate the homeostasis essential for growth and reproduction. Discover examples of alterations that occur when feedback mechanisms malfunction.

6 Lessons in Chapter 8: AP Biology: Requirements of Biological Systems
Test your knowledge with a 30-question chapter practice test
Living Systems Requirement for Free Energy and Matter

1. Living Systems Requirement for Free Energy and Matter

Free energy and matter are required by all living things in order to grow, reproduce, and maintain biological processes. Additionally, free energy and matter must also be recycled through the environment in order to remove dead material and allow for new growth.

What is Entropy? - Definition, Law & Formula

2. What is Entropy? - Definition, Law & Formula

In this lesson, you will learn the definition of entropy and discover how it can be applied to everyday situations. You will explore the second law of thermodynamics which is where entropy is introduced, and you will examine the formula for entropy and find out how to use it in a variety of instances.

The Relationship Between Enthalpy (H), Free Energy (G) and Entropy (S)

3. The Relationship Between Enthalpy (H), Free Energy (G) and Entropy (S)

In this video lesson, we'll study free energy (G) and its relationship to enthalpy, entropy and temperature. You'll also learn why free energy (G) is the single most useful criterion for predicting the spontaneity and direction of a chemical reaction.

Predicting the Entropy of Physical and Chemical Changes

4. Predicting the Entropy of Physical and Chemical Changes

Ever wonder why your bedroom always ends up a mess within hours of you tidying up? That is the magic of entropy. In this lesson, you'll learn why disorder is the natural state of matter and how we can predict entropy change in a physical or chemical reaction.

The Environmental Requirements for Growth, Reproduction & Dynamic Homeostasis

5. The Environmental Requirements for Growth, Reproduction & Dynamic Homeostasis

Cells need to maintain internal environments that are different from their external environments in order to grow and reproduce. In this video lesson, you will understand some ways that cells can control their internal conditions to ensure proper biological functioning.

Using Feedback Systems to Regulate Growth, Reproduction & Dynamic Homeostasis

6. Using Feedback Systems to Regulate Growth, Reproduction & Dynamic Homeostasis

In order to maintain specific internal conditions, organisms use feedback mechanisms. Feedback is essential to the regulation of internal environments, which allows for proper biological functioning.

Chapter Practice Exam
Test your knowledge of this chapter with a 30 question practice chapter exam.
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Practice Final Exam
Test your knowledge of the entire course with a 50 question practice final exam.
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