Biology 2e is designed to cover the scope and sequence requirements of a typical two-semester biology course for science majors. The text provides comprehensive coverage of foundational research and core biology concepts through an evolutionary lens. Biology includes rich features that engage students in scientific inquiry, highlight careers in the biological sciences, and offer everyday applications. The book also includes various types of practice and homework questions that help students understand—and apply—key concepts. The 2nd edition has been revised to incorporate clearer, more current, and more dynamic explanations, while maintaining the same organization as the first edition. Art and illustrations have been substantially improved, and the textbook features additional assessments and related resources.

By the end of this section, you will be able to do the following:

Discuss the ways in which carbohydrate metabolic pathways, glycolysis, and the citric acid cycle interrelate with protein and lipid metabolic pathways
Explain why metabolic pathways are not considered closed systems

By the end of this section, you will be able to do the following:

Describe the overall result in terms of molecules produced during the chemical breakdown of glucose by glycolysis
Compare the output of glycolysis in terms of ATP molecules and NADH molecules produced

An overview of cellular respiration and mitochondria.

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This comprehensive study guide covers the main terms and concepts needed for a unit on cellular respiration.

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This 13-minute video lesson provides an overview of glycolysis. [Biology playlist: Lesson 24 of 71].

Khan Academy learning modules include a Community space where users can ask questions and seek help from community members. Educators should consult with their Technology administrators to determine the use of Khan Academy learning modules in their classroom. Please review materials from external sites before sharing with students.

This 14-minute video lesson presents an introduction to cellular respiration, glycolysis, the Kreb's Cycle, and the electron transport chain. [Biology playlist: Lesson 21 of 71].

Khan Academy learning modules include a Community space where users can ask questions and seek help from community members. Educators should consult with their Technology administrators to determine the use of Khan Academy learning modules in their classroom. Please review materials from external sites before sharing with students.

In this unit, students look at the components of cells and their functions and discover the controversy behind stem cell research. The first lesson focuses on the difference between prokaryotic and eukaryotic cells. In the second lesson, students learn about the basics of cellular respiration. They also learn about the application of cellular respiration to engineering and bioremediation. The third lesson continues students' education on cells in the human body and how (and why) engineers are involved in the research of stem cell behavior.

In this lesson, students learn about the basics of cellular respiration. They also learn about the application of cellular respiration to engineering and bioremediation. And, students are introduced to the process of bioremediation and several examples of how bioremediation is used during the cleanup of environmental contaminants.

This pathways explores how cells harvest energy using cellular respiration in eukaryotic cells and photosynthesis in plant cells.

Explore the specific reactions that happen during the cellular respiration process.

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This pathway provides an introduction to cellular metabolism, including a comparison of the processes of photosynthesis and cellular respiration. For a deeper look at this topic, we recommend the pathways Metabolism, Cellular Respiration and The Biological Process of Photosynthesis from the OpenStax textbook Biology for AP® Courses.

This site provides information on carbohydrate metabolism regulation through a quiz set-up. Answer each question, and the correct answers will be presented, complete with a full tutorial.