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Ch 2: Enzymes and Metabolism

About This Chapter

Study the video lessons in this chapter to learn about enzymes and metabolism within the discipline of biology. Use the chapter's self-assessment quizzes to apply what you learn and determine your mastery of these topics.

Enzymes & Metabolism - Chapter Summary

Whether you are a little rusty on certain metabolic functions or need a complete run-down, the lessons in this chapter will help you review what you need to know about enzymes and metabolism. Each lesson provides brief, engaging videos presented by expert instructors. The following subjects are among those addressed in this chapter:

  • Function of enzymes
  • Enzymatic reactions, including inhibition and regulation
  • Environmental effects of enzymes
  • Enzyme activity: Lock and key and induced fit models
  • Products and steps of the citric acid, or Krebs, cycle
  • The electron transport chain
  • Metabolism of fats and proteins

Increase your understanding with the thorough refresher in these lessons. Every lesson comes with in-depth theoretical exploration as well as real-world examples to apply learning. The detailed videos in this chapter describe key biological concepts and come with transcripts if you prefer to read along. You will be able to further enhance your knowledge by making use of the practice quizzes after each lesson and an exam at the end of the chapter.

7 Lessons in Chapter 2: Enzymes and Metabolism
Test your knowledge with a 30-question chapter practice test
Function of Enzymes: Substrate, Active Site & Activation Energy

1. Function of Enzymes: Substrate, Active Site & Activation Energy

In this lesson, we'll learn how enzymes function to lower the activation energy of a chemical reaction. Enzymes bind to their substrates to perform all kinds of important and essential cellular processes, as well as processes that help you enjoy a slice of pizza!

Enzymatic Reactions: Inhibition and Regulation

2. Enzymatic Reactions: Inhibition and Regulation

Enzymes are generally not allowed to run uncontrolled in a cell. While they are useful in catalyzing reactions, there is a time and place for everything. In this lesson, we'll discuss enzyme activators and inhibitors that regulate these reactions positively and negatively, respectively.

Enzyme Activity & Inhibition: Structure, Substrates, pH & Temperature

3. Enzyme Activity & Inhibition: Structure, Substrates, pH & Temperature

Enzymes appreciate the right working conditions. Can you blame them? We all work best in the correct environment. In this lesson, we'll learn how substrate concentration, temperature, and pH affect enzyme activity and structure.

Lock and Key and Induced Fit Models of Enzyme Activity

4. Lock and Key and Induced Fit Models of Enzyme Activity

Cells are full of chemical reactions, but nature doesn't like waiting any more than we do. Enzymes help speed up these reactions, and over time, scientists have modified their theories on how this works. In this lesson, we'll explore the two main theories that explain this.

The Citric Acid (Krebs) Cycle: Products and Steps

5. The Citric Acid (Krebs) Cycle: Products and Steps

In this lesson, we return to the process of cellular respiration for the second act of creating energy from food. In this act, products from glycolysis feed into the next stage, the citric acid cycle.

The Electron Transport Chain: Products and Steps

6. The Electron Transport Chain: Products and Steps

In this lesson, we'll learn about the finale of cellular respiration. The electron transport chain uses products from the first two acts of glycolysis and the citric acid cycle to complete the chemical reaction that turns our food into usable cellular energy.

The Metabolism of Fats, Proteins & Carbohydrates

7. The Metabolism of Fats, Proteins & Carbohydrates

Everybody eats. But what happens to that food once it is eaten? Cellular respiration explains carbohydrates, but what about fat and protein? This lesson explores how all three macronutrients are used by the body.

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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