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Chapter 7: Problem 1

The reactions of the Krebs cycle occur in the a. inner membrane of the mitochondria. b. intermembrane space of the mitochondria. c. cytoplasm. d. matrix of the mitochondria.

Short Answer

Expert verified
d. matrix of the mitochondria.

Step by step solution

01

- Understanding the Krebs Cycle

The Krebs cycle, also known as the citric acid cycle, is a series of chemical reactions used by all aerobic organisms to generate energy through the oxidation of acetate.
02

- Identifying the Mitochondrial Structure

The mitochondrion has several key components: the outer membrane, intermembrane space, inner membrane, and the matrix.
03

- Locating the Krebs Cycle

The Krebs cycle specifically takes place in the matrix of the mitochondria, where the necessary enzymes and substrates are found.
04

- Reviewing Other Options

Review why the other options are incorrect: the inner membrane and intermembrane space are involved in the electron transport chain, while the cytoplasm is where glycolysis occurs.

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Key Concepts

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

mitochondria
Mitochondria are often referred to as the powerhouses of the cell. They generate most of the cell's supply of adenosine triphosphate (ATP), which cells use as a source of chemical energy. The structure of mitochondria is quite unique.
They have a double membrane: an outer membrane and a highly folded inner membrane.
The space between the two membranes is called the intermembrane space. Inside the inner membrane is a dense fluid called the matrix. The matrix is where important processes such as the Krebs cycle occur.
Keep in mind that the inner membrane is where the electron transport chain is found, playing a crucial role in cellular respiration.
citric acid cycle
The citric acid cycle, also known as the Krebs cycle, is a central part of cellular respiration. This cycle converts simple molecules like acetate into carbon dioxide and transfers energy to produce ATP.
During this cycle, enzyme reactions take place in the matrix of the mitochondria. The main goal is to harvest high-energy electrons from organic fuels like glucose.
Enzymes in the matrix facilitate these reactions and produce key molecules, such as NADH and FADH2, that carry electrons to the electron transport chain. These high-energy carriers are essential for generating large amounts of ATP.
cellular respiration
Cellular respiration is the process by which cells convert nutrients into energy in the form of ATP. It takes place in three main stages: glycolysis, the Krebs cycle, and the electron transport chain.
Glycolysis happens in the cytoplasm and breaks down glucose into pyruvate. This pyruvate then enters the mitochondria where it participates in the Krebs cycle.
The Krebs cycle occurs in the mitochondria's matrix and produces molecules that carry electrons to the electron transport chain, located in the inner membrane. Here, ATP is generated in large amounts, and this energy is used by cells to perform various functions.
matrix
The matrix is the innermost part of the mitochondria and is filled with a dense, jelly-like fluid. It contains the enzymes necessary for the Krebs cycle, which is crucial for cellular respiration.
In the matrix, pyruvate from glycolysis is converted into Acetyl-CoA, which then enters the citric acid cycle. The enzymes in the matrix catalyze reactions that produce ATP, CO2, NADH, and FADH2.
This environment is optimized for these biochemical reactions, ensuring efficient energy production. The matrix is also where the mitochondrial DNA is located, which carries genes essential for mitochondrial function.

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Most popular questions from this chapter

Which of the following accurately describes a distinction between lactic acid fermentation and ethanol fermentation? a. Lactic acid fermentation occurs in prokaryotes, whereas ethanol fermentation occurs in eukaryotes. b. The final electron acceptor in lactic acid fermentation is pyruvate; the final electron acceptor in ethanol fermentation is acetaldehyde. c. In lactic acid fermentation, NADH is produced by glycolysis; in ethanol fermentation, NADH is produced by the Krebs cycle. d. In lactic acid fermentation, cells use \(\mathrm{CO}_{2}\) in place of oxygen; in ethanol fermentation, cells use \(\mathrm{SO}_{4}\).

Which of the following is NOT true of \(\beta\) oxidation of fatty acids? a. The process occurs in the matrix of the mitochondrion. b. Acetyl groups are removed from fatty acid chain ends. c. Respiration of a 6 -carbon fatty acid molecule yields more ATP than respiration of a 6-carbon glucose molecule. d. All of the above

Which pathway is seen in both fermentation and aerobic respiration? a. Krebs cycle c. Glycolysis b. Electron transport d. Pyruvate oxidation

What is the purpose of cellular respiration? a. To get \(\mathrm{O}_{2}\) into our bodies and to get \(\mathrm{CO}_{2}\) out of our bodies b. To use the energy of sunlight to synthesize sugars c. To make ATP to power cellular activities d. To hydrolyze ATP

The \(\mathrm{P} / \mathrm{O}\) ratio a. is the amount of ATP synthesized by substrate-level phosphorylation. b. has changed over time due to our increased understanding of how ATP synthase works. c. is higher than originally thought because of our better understanding of chemiosmosis. d. All of the above
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