Biology is designed for multi-semester biology courses for science majors. It is grounded on an evolutionary basis and includes exciting features that highlight careers in the biological sciences and everyday applications of the concepts at hand. To meet the needs of today’s instructors and students, some content has been strategically condensed while maintaining the overall scope and coverage of traditional texts for this course. Instructors can customize the book, adapting it to the approach that works best in their classroom. Biology also includes an innovative art program that incorporates critical thinking and clicker questions to help students understand—and apply—key concepts.

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

This 17-minute video lesson looks at oxidation and reduction in cellular respiration. It Reconciles the biology and chemistry definitions of oxidation and reduction. [Biology playlist: Lesson 23 of 71].

Biology is designed for multi-semester biology courses for science majors. It is grounded on an evolutionary basis and includes exciting features that highlight careers in the biological sciences and everyday applications of the concepts at hand. To meet the needs of today’s instructors and students, some content has been strategically condensed while maintaining the overall scope and coverage of traditional texts for this course. Instructors can customize the book, adapting it to the approach that works best in their classroom. Biology also includes an innovative art program that incorporates critical thinking and clicker questions to help students understand—and apply—key concepts.

By the end of this section, you will be able to:Discuss the ways in which carbohydrate metabolic pathways, glycolysis, and the citric acid cycle interrelate with protein and lipid metabolic pathwaysExplain why metabolic pathways are not considered closed systems

By the end of this section, you will be able to:Discuss the importance of electrons in the transfer of energy in living systemsExplain how ATP is used by the cell as an energy source

By the end of this section, you will be able to:Discuss the importance of electrons in the transfer of energy in living systemsExplain how ATP is used by the cell as an energy source

By the end of this section, you will be able to:Describe the overall result in terms of molecules produced in the breakdown of glucose by glycolysisCompare the output of glycolysis in terms of ATP molecules and NADH molecules produced

By the end of this section, you will be able to:Describe the overall result in terms of molecules produced in the breakdown of glucose by glycolysisCompare the output of glycolysis in terms of ATP molecules and NADH molecules produced

By the end of this section, you will be able to:Discuss the fundamental difference between anaerobic cellular respiration and fermentationDescribe the type of fermentation that readily occurs in animal cells and the conditions that initiate that fermentation

By the end of this section, you will be able to:Discuss the fundamental difference between anaerobic cellular respiration and fermentationDescribe the type of fermentation that readily occurs in animal cells and the conditions that initiate that fermentation

By the end of this section, you will be able to:Explain how a circular pathway, such as the citric acid cycle, fundamentally differs from a linear pathway, such as glycolysisDescribe how pyruvate, the product of glycolysis, is prepared for entry into the citric acid cycle

By the end of this section, you will be able to:Explain how a circular pathway, such as the citric acid cycle, fundamentally differs from a linear pathway, such as glycolysisDescribe how pyruvate, the product of glycolysis, is prepared for entry into the citric acid cycle

By the end of this section, you will be able to:Describe how electrons move through the electron transport chain and what happens to their energy levelsExplain how a proton (H+) gradient is established and maintained by the electron transport chain