Table of contents

1. Matter and Measurements4h 31m
2. Atoms and the Periodic Table5h 23m
3. Ionic Compounds2h 18m
4. Molecular Compounds2h 18m
5. Classification & Balancing of Chemical Reactions3h 17m
6. Chemical Reactions & Quantities2h 27m
7. Energy, Rate and Equilibrium3h 46m
8. Gases, Liquids and Solids3h 25m
9. Solutions4h 10m
10. Acids and Bases3h 29m
11. Nuclear Chemistry56m
BONUS: Lab Techniques and Procedures1h 38m
BONUS: Mathematical Operations and Functions47m
12. Introduction to Organic Chemistry1h 34m
13. Alkenes, Alkynes, and Aromatic Compounds2h 12m
14. Compounds with Oxygen or Sulfur1h 6m
15. Aldehydes and Ketones1h 1m
16. Carboxylic Acids and Their Derivatives1h 11m
17. Amines39m
18. Amino Acids and Proteins1h 51m
19. Enzymes1h 37m
20. Carbohydrates1h 41m
21. The Generation of Biochemical Energy2h 8m
22. Carbohydrate Metabolism2h 22m
23. Lipids2h 26m
24. Lipid Metabolism1h 45m
25. Protein and Amino Acid Metabolism1h 37m
26. Nucleic Acids and Protein Synthesis2h 54m

21. The Generation of Biochemical Energy

Electron Transport Chain

GOB Chemistry

21. The Generation of Biochemical Energy

Electron Transport Chain

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0:34 minutes

Problem 44

Textbook Question

What happens to the energy level as electrons are passed along in electron transport?

Verified step by step guidance

Understand the concept of electron transport: Electron transport occurs in the mitochondria during cellular respiration, specifically in the electron transport chain (ETC). Electrons are transferred through a series of protein complexes embedded in the inner mitochondrial membrane.

Recognize the role of energy levels: As electrons move through the electron transport chain, they are passed from one protein complex to another. Each transfer involves a change in energy level, as electrons move from higher-energy states to lower-energy states.

Explain the energy release: The decrease in energy level as electrons are passed along the chain is used to pump protons (H⁺ ions) across the mitochondrial membrane, creating a proton gradient. This gradient is essential for ATP synthesis.

Connect to ATP production: The energy stored in the proton gradient is harnessed by ATP synthase to convert ADP and inorganic phosphate (Pi) into ATP, the primary energy currency of the cell.

Summarize the process: The electron transport chain is a mechanism for converting the energy from high-energy electrons into a usable form (ATP) by systematically lowering their energy level and utilizing the released energy for cellular work.

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Key Concepts

Here are the essential concepts you must grasp in order to answer the question correctly.

Electron Transport Chain

The electron transport chain (ETC) is a series of protein complexes and other molecules located in the inner mitochondrial membrane. It facilitates the transfer of electrons from electron donors like NADH and FADH2 to electron acceptors, ultimately leading to the production of ATP. As electrons move through the chain, they release energy, which is used to pump protons across the membrane, creating a proton gradient.

Energy Levels and Redox Reactions

In the context of the electron transport chain, energy levels refer to the potential energy associated with electrons as they undergo redox reactions. As electrons are transferred from higher to lower energy states, energy is released. This energy is harnessed to perform work, such as synthesizing ATP, and is a fundamental principle of cellular respiration.

Proton Gradient and Chemiosmosis

The proton gradient created by the electron transport chain is essential for chemiosmosis, a process that generates ATP. As protons are pumped into the intermembrane space, a concentration gradient forms, driving protons back into the mitochondrial matrix through ATP synthase. This flow of protons provides the energy needed to convert ADP and inorganic phosphate into ATP, linking electron transport to energy production.

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