About This Chapter
AP Biology: Requirements of Biological Systems - Chapter Summary
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. The chapter has been designed by expert instructors and has been broken up into short lessons to help you review. The engaging video lessons will help you prepare for the exam, one topic at a time. By the end of this chapter, you should be able answer questions on the following AP Biology areas:
- Explaining the requirements of living systems for free energy and matter
- Identifying the environmental requirements for growth, reproduction and change
- Describing the role of feedback mechanisms in maintaining homeostasis
- Defining entropy
- Examining the relationship between enthalpy, free energy and entropy
- Predicting entropy for chemical and physical changes
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.
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.
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.
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.
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.
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.
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Other chapters within the AP Biology: Exam Prep course
- Scientific Principles
- AP Biology: The Origin of Life on Earth
- AP Biology: Evolution Overview
- AP Biology: Inorganic Chemistry Review
- AP Biology: Organic Chemistry Review
- AP Biology: Enzymatic Biochemistry
- AP Biology: Cell Biology
- AP Biology: Cell Division
- AP Biology: Metabolic Biochemistry
- AP Biology: DNA and RNA Overview
- AP Biology: DNA Replication
- AP Biology: The Transcription and Translation Process
- AP Biology: Genetics and Heredity
- AP Biology: Genetic Mutations
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- AP Biology: Plant Biology
- AP Biology: Plant Reproduction and Growth
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- AP Biology: The Circulatory, Respiratory, and Excretory Systems
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- AP Biology: Ecology Overview
- AP Biology: Animal Behavior
- AP Biology: Basic Molecular Biology Laboratory Techniques
- AP Biology: Analyzing Scientific Data
- AP Biology: Laboratory
- AP Biology Exam Information
- AP Biology Flashcards