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Photosynthesis Overview

Photosynthesis Overview. Hello, and welcome to our photosynthesis introduction. During this tutorial, we will look at some of the basic concepts underlying the principles of photosynthesis.

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Photosynthesis Overview

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  1. Photosynthesis Overview Hello, and welcome to our photosynthesis introduction. During this tutorial, we will look at some of the basic concepts underlying the principles of photosynthesis.

  2. In its most basic definition, photosynthesis is the conversion of the energy from sunlight to a stored chemical energy, which can be used by living things at later times.

  3. In eukaryotic cells, photosynthesis occurs in the chloroplast, an organelle present in plant cells. Photosynthesis can be broken down into two steps, the Light Reaction and the Calvin Cycle.

  4. Lets start by taking a closer look at the light reactions

  5. This builds up a concentration of protons. The protons then diffuse back through ATP Synthase. This action creates molecules of ATP by combining ADP and free floating phosphates At the start of the light reaction, or light dependent reaction, photons of light are absorbed by chlorophyll molecules The movement of electrons through the electron transport chain forces Hydrogen ions, also called protons, across the membrane Finally, the electrons leaving the electron transport chain are used to make molecules of NADPH. The excited electrons move down the electron transport chain

  6. By the end of the Light reaction, we have made both ATP and NADPH. These are both energy molecules, which now will move to the Calvin Cycle where they will be used to construct the sugar

  7. The Calvin Cycle is a multistep process for constructing a sugar, or carbohydrate. The Calvin Cycle uses the carbon from carbon dioxide molecules and attaches them together using the energy from ATP and NADPH (the two energy molecules made during the light reaction).

  8. By the end of the Calvin Cycle, a sugar has been made. ADP and NADP+ return to the Light reaction to get reenergized

  9. The sugar is now stored chemical energy. When a cell needs energy, the sugar will be sent to the mitochondria where it will be converted to large amounts of ATP (cellular energy). This process, known as Cellular Respiration, can be accessed through a similar tutorial.

  10. I hope you have found this photosynthesis tutorial helpful To start this tutorial again, please press the button

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