Q:

Which organelle is the site of cellular respiration?

A:

Quick Answer

The mitochondria of the eukaryotic cells are the sites of cellular respiration and where most of the steps take place. Cellular respiration allows for the release of energy stored in chemical bonds of glucose (obtained from food) to form adenosine triphosphate, which is the energy currency of the cell.

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Full Answer

Cellular respiration occurs in multiple steps. Glucose is first broken down into smaller pyruvate molecules in the cytoplasm. After this step, if the cell does not have oxygen, the pyruvate is fermented in an anaerobic process to release lactate. In the presence of oxygen, aerobic respiration takes place in the mitochondria.

The pyruvate is transported to the mitochondria, where it first enters the tricarboxylic acid cycle, which is also known as Krebs cycle. Pyruvate is oxidized to acetyl CoA, which then enters the TCA cycle, resulting in the production of one ATP molecule and three NADH, or reduced nicotinamide dinucleotide, molecules. The TCA cycle is not a major source for ATP production.

The NADH produced is then cycled through the electron transport along the convoluted membranes of the mitochondria. The oxidation of NADH to NAD+ allows for ATP production. Most of the ATP produced during cellular respiration is produced during the electron transport phase.

Mitochondria are present in all living eukaryotic cells. Some cells, such as fat cells and muscle cells, may have more mitochondria because they either store energy or have a need to respond quickly to move and do work.

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Related Questions

  • Q:

    In which organelle does cellular respiration take place?

    A:

    Cellular respiration takes place in the organelles called mitochondria. The mitochondria take in glucose, a type of sugar, and change it in the presence of oxygen into an energy-rich molecule called ATP, or adenosine triphosphate. For every molecule of glucose, 36 molecules of ATP are made.

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  • Q:

    Where does cell respiration take place?

    A:

    According to Hartnell College, cellular respiration takes place in the cytoplasm of cells and inside the mitochondria. Mitochondria are often called the cell’s “power plant,” because most of the process of cellular respiration takes place inside them. This process produces energy within the cell.

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  • Q:

    Where does aerobic respiration take place?

    A:

    Aerobic respiration takes place within the cell cytoplasm, in organelles known as mitochondria. Aerobic respiration is a process in which energy is produced, then released. During this process, sugars are converted into amino acids.

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  • Q:

    Which organelle performs cellular respiration?

    A:

    According to About.com, cellular respiration takes place in the mitochondria. While mitochondria primarily exist to serve as “power plants” for the cell, converting natural resources into usable energy, they also play a role in cellular division, cell growth and cell death.

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