Ch 19: GRE Biology: Environmental Exchanges in Organismal Biology

About This Chapter

Prepare for organismal biology questions on the GRE Biology exam with help from our self-paced video lessons and quizzes. Feedback mechanisms, homeostasis and energy transformation are just some of the topics covered in this chapter.

GRE Biology: Environmental Exchanges in Organismal Biology - Chapter Summary

Use this chapter to review living organisms' basic requirements and the mechanisms they use to maintain their internal environments. Lessons are designed to prepare you for GRE Biology questions on the following topics:

  • The necessity of matter in living systems
  • Energy transformation in plants, animals and bacteria
  • Homeostasis and the regulation of internal environments
  • Positive and negative feedback mechanisms

This chapter contains short, entertaining videos that you can view at your convenience. The multiple-choice lesson quizzes and chapter test can also be accessed as many times as you need to ensure you're getting the hang of key organismal biology topics.

GRE Biology Objectives

Approximately 10% of the GRE Biology exam's 190 multiple-choice questions cover the area of animal structure, function and organization. Lessons in this chapter have been created to help you prepare for questions that require an understanding of how water, gas, nutrients and energy are exchanged between cells' internal and external environments.

Scores on these and other content areas - such as animal reproduction and development, plant structure, cellular and molecular biology, evolution and ecology - will be used to determine your preparedness for graduate studies in biology or a related field. However, exam scores are not necessarily a requirement for admission. Students can opt to take the test in order to supplement their application materials.

4 Lessons in Chapter 19: GRE Biology: Environmental Exchanges in Organismal Biology
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.

Energy and Life: The Transformation of Energy in Living Organisms

2. Energy and Life: The Transformation of Energy in Living Organisms

While the sun is an excellent source of energy, not all forms of life can utilize the sun's energy directly. This lesson describes how plants transform the sun's energy into potential energy stored in sugar, how living organisms utilize energy in sugar to perform work, and how the relationship between photosynthesis and cellular respiration is necessary for life.

The Environmental Requirements for Growth, Reproduction & Dynamic Homeostasis

3. 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

4. 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.
Not Taken
Practice Final Exam
Test your knowledge of the entire course with a 50 question practice final exam.
Not Taken

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