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Ch 23: Enzymes and Metabolism for the MCAT: Help and Review

About This Chapter

The Enzymes and Metabolism chapter of this Medical College Admission Test (MCAT) Help and Review course is the simplest way to master enzymes and metabolism. This chapter uses simple and fun videos that are about five minutes long, plus lesson quizzes and a chapter exam to ensure students learn the essentials of enzymes and metabolism.

Who's it for?

Anyone who needs help preparing for the science section of the MCAT exam will benefit from taking this course. You will be able to grasp the subject matter faster, retain critical knowledge longer and earn better grades. You're in the right place if you:

  • Have fallen behind in understanding enzyme function or the steps in cellular respiration.
  • Need an efficient way to learn about enzymes and metabolism.
  • Learn best with engaging auditory and visual tools.
  • Struggle with learning disabilities or learning differences, including autism and ADHD.
  • Experience difficulty understanding your teachers.
  • Missed class time and need to catch up.
  • Can't access extra MCAT science preparation resources at school.

How it works:

  • Start at the beginning, or identify the topics that you need help with.
  • Watch and learn from fun videos, reviewing as needed.
  • Refer to the video transcripts to reinforce your learning.
  • Test your understanding of each lesson with short quizzes.
  • Submit questions to one of our instructors for personalized support if you need extra help.
  • Verify you're ready by completing the Enzymes and Metabolism chapter exam.

Why it works:

  • Study Efficiently: Skip what you know, review what you don't.
  • Retain What You Learn: Engaging animations and real-life examples make topics easy to grasp.
  • Be Ready on Test Day: Use the Enzymes and Metabolism chapter exam to be prepared.
  • Get Extra Support: Ask our subject-matter experts any relevant question. They're here to help!
  • Study With Flexibility: Watch videos on any web-ready device.

Students will review:

In this chapter, you'll learn the answers to questions including:

  • What roles do enzymes play in cellular reactions?
  • How do enzymes behave in chemical reactions?
  • What is the definition of activation energy?
  • Why are some enzymes specific to a sole substrate?
  • What steps occur in the glycolysis pathway?
  • How do fats and proteins metabolize?
  • What products result from the citric acid or Krebs cycle?
  • What stages occur in the electron transport chain?

16 Lessons in Chapter 23: Enzymes and Metabolism for the MCAT: Help and Review
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.

Glycolysis Pathway: Steps, Products & Importance

4. Glycolysis Pathway: Steps, Products & Importance

Cellular respiration creates chemical energy in the form of ATP from the food we eat and the air we breathe. In this lesson, we'll learn about the first part of this process, glycolysis.

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.

Allosteric Regulation of Enzymes: Definition & Significance

7. Allosteric Regulation of Enzymes: Definition & Significance

In this lesson, we'll conduct a brief review of enzymes, including what they are and what they do. We'll also use the analogy of a light switch to explore allosteric regulation and the reason that the process is so important to enzymes.

Understanding the Adenylate Cyclase Pathway

8. Understanding the Adenylate Cyclase Pathway

In this lesson, we'll use easy-to-understand analogies, like armies and snowflakes, to learn about the enzyme, adenylate cyclase. In addition, we''ll explore how adenylate cyclase is used by the cell and why its regulation is so important.

Adenylate Cyclase Inhibitors: Definition & Overview

9. Adenylate Cyclase Inhibitors: Definition & Overview

This lesson will remind you what adenylate cyclase is and what it does. Then you will further discover what kind of inhibitors block its action and their potential uses in medicine.

Lock and Key and Induced Fit Models of Enzyme Activity

10. 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 Metabolism of Fats, Proteins & Carbohydrates

11. 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.

Chemical Digestion of Carbohydrates: Definition & Process

12. Chemical Digestion of Carbohydrates: Definition & Process

Carbohydrates are an important energy source, but must be broken down to be absorbed out of the digestive tract. In this lesson, you will learn how disaccharides and polysaccharides are broken down to monosaccharides through a process called hydrolysis.

Organic Chemical Reactions: Redox, Esterification & Fermentation

13. Organic Chemical Reactions: Redox, Esterification & Fermentation

There are many different types of reactions that occur in organic chemistry. This lesson will highlight three reactions, explaining which organic molecules are the reactants and which are the products, as well as what occurs during the reaction.

Glycogenesis, Glycogenolysis, and Gluconeogenesis

14. Glycogenesis, Glycogenolysis, and Gluconeogenesis

Your body uses processes to keep blood glucose levels within the normal range. Learn how your body decreases blood glucose levels through glycogenesis and how it boosts glucose levels through glycogenolysis and gluconeogenesis in this lesson.

The Pentose Phosphate Pathway

15. The Pentose Phosphate Pathway

There are hundreds of various chemical reactions that occur within cells. In this lesson, we are going to check out one of those reactions, called the pentose phosphate pathway. Let's see what this reaction is, as well as what it produces and why it's important.

Substrate-level Phosphorylation and Oxidative Phosphorylation

16. Substrate-level Phosphorylation and Oxidative Phosphorylation

Your body is always using energy. This energy, in the form of ATP, is generated within your cells through substrate-level phosphorylation or oxidative phosphorylation. Learn about these processes and the role mitochondria play in making energy.

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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Other Chapters

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