Q:

What are the products of the Calvin cycle?

A:

The final product of the Calvin cycle, the second metabolic cycle of photosynthesis, is the sugar glucose. Carbon dioxide joins with organic molecules to produce glyceraldehyde-3-phosphate. After several glyceraldehyde-3-phosphates are produced from the cycle, they join together to form glucose.

The Calvin cycle is known as the dark reaction because it is the metabolic cycle of photosynthesis that does not require light. During the Calvin cycle carbon dioxide from the air is added to an organic molecule, RuBP, which is already present in the cell. RuBP becomes unstable and splits into two three-carbon chains known as 3-phosphoglycerate. The two molecules move through a series of reactions using the energies ATP and NADPH, which are produced from the light reactions of photosynthesis. Finally, the 3-phosphoglycerates are converted into two molecules of glyceraldehyde-3-phosphate. Then, some of the glcyeraldehyde-3-phosphates join together to form glucose. Several cycles of the Calvin cycle are required to produce one glucose chain because only one carbon atom is added to the chain from each molecule of carbon dioxide. However, once the glucose chain is formed, it is usually released to the plant to serve as energy for building new cells. Some of the glucose remains in the Calvin cycle to help facilitate the process.

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Related Questions

  • Q:

    What happens during the Calvin cycle?

    A:

    The Calvin cycle is a metabolic process that occurs in the chloroplasts of plant cells. Its main function is to create sugar from carbon dioxide for the plant to use as a source of energy.

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  • Q:

    When does the Calvin cycle of photosynthesis begin?

    A:

    The Calvin cycle of photosynthesis begins after light energy is transformed into chemical energy by the cells of plants. The adenosine triphosphate, or ATP, molecules created power the Calvin cycle. The Calvin cycle uses the energy to create carbohydrates from water and carbon dioxide.

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  • Q:

    Where does the Calvin cycle occur?

    A:

    The Calvin cycle is a metabolic pathway that is found in the stroma of the chloroplast. Carbon enters the pathway in the form of CO2 and exits in the form of sugar.

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  • Q:

    How does the Calvin cycle depend on light reactions?

    A:

    The Calvin cycle depends on light reactions because they power the electron transport necessary to produce ATP, which in turn powers the Calvin cycle. The Calvin cycle is the major method by which plants and algae produce carbohydrates and oxygen from water and carbon dioxide. It is thus one of the most important chemical cycles in nature as the basis of nearly every food chain.

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