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Chapter 3: Problem 16

How is ATP formed during cellular respiration? p. \(48 .\)

Short Answer

Expert verified
ATP is formed during cellular respiration through glycolysis, the Krebs cycle, and the electron transport chain, resulting in a total of about 36-38 ATP molecules per glucose.

Step by step solution

01

Understanding Cellular Respiration

Cellular respiration is the process by which cells convert glucose and oxygen into energy, carbon dioxide, and water. This energy is stored in the form of ATP (adenosine triphosphate), which is used by the cell for various functions.
02

Glycolysis

The first stage of cellular respiration is glycolysis, which occurs in the cytoplasm of the cell. Here, glucose is broken down into two molecules of pyruvate. During this process, 2 ATP molecules are used initially, but 4 ATP molecules are produced, resulting in a net gain of 2 ATP molecules.
03

Krebs Cycle

The second stage is the Krebs cycle, which takes place in the mitochondria. The pyruvate produced during glycolysis is converted into acetyl-CoA, which enters the Krebs cycle. This cycle generates 2 ATP molecules directly for each glucose molecule processed.
04

Electron Transport Chain

The final stage is the electron transport chain, also located in the mitochondria. Electrons from NADH and FADH2, which are generated during glycolysis and the Krebs cycle, are transferred through a series of proteins. This transfer creates a proton gradient across the mitochondrial membrane, which powers ATP synthase to produce ATP. About 32-34 ATP molecules are generated in this step from one molecule of glucose.

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Key Concepts

These are the key concepts you need to understand to accurately answer the question.

Cellular Respiration
Cellular respiration is a vital process for all living cells, enabling them to convert nutrients into energy. This process involves the breakdown of glucose, a simple sugar, in the presence of oxygen to produce energy in the form of ATP, water, and carbon dioxide. The energy stored in ATP is then available for the cell to perform various functions, from muscle contraction to cell division. By burning glucose efficiently, cells can maximize energy production, highlighting cellular respiration as a crucial energy-releasing pathway.
Glycolysis
Glycolysis, the first phase of cellular respiration, occurs in the cytoplasm of the cell, irrespective of the presence of oxygen. This process breaks down one molecule of glucose into two molecules of pyruvate. For every glucose molecule, 2 ATP are initially invested, but the process gains back 4 ATP and 2 NADH, resulting in a net gain of 2 ATPs. Glycolysis not only provides instant energy but also prepares glucose units for further breakdown in the mitochondria through the Krebs Cycle and Electron Transport Chain.
Krebs Cycle
The Krebs cycle, also known as the citric acid cycle, is the second stage of cellular respiration. Taking place in the mitochondria, this cycle further breaks down pyruvate into carbon dioxide, capturing high-energy electrons in FADH2 and NADH. Each turn of the cycle produces 2 molecules of ATP directly, but more importantly, it contributes electrons that are essential for the electron transport chain. By transforming acetyl-CoA into energy-carrying molecules, the Krebs Cycle plays a key role in energy extraction.
Electron Transport Chain
The electron transport chain (ETC) is the final and most ATP-productive stage of cellular respiration. Located in the inner mitochondrial membrane, the chain uses electrons from NADH and FADH2 to pump protons across the membrane, creating a proton gradient. This gradient is then used by ATP synthase to generate ATP. The ETC is remarkably efficient, producing about 32-34 ATP molecules from one glucose molecule. This process highlights not only the complexity but also the efficiency of cellular energy production.

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Most popular questions from this chapter

What is the main energy currency of the cell? Where is it formed? Where does it get its energy? pp. 60-62.

What are primary cilia? Why are they important? Go online and determine some diseases that may involve malfunctioning or defective primary cilia. p. 58 .

Describe the concepts of cellular and organismic homeostasis. How are they related? How does environmental homeostasis or environmental quality affect them? pp. \(42,45-47\).

List several membrane-found cellular organelles. This type of cellular compartmentalization allows for greater efficiency. Why? p. 42 .

Describe the First and Second Laws of Thermodynamics. pp. \(59-60 .\)
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