Photosynthesis - Light Dependent Reactions and the Calvin Cycle

This biology video tutorial provides a basic introduction into photosynthesis - the process by which plants use energy from sunlight to convert Carbon Dioxide and Water into Oxygen gas and sugars such as Glucose. Photosynthesis can be broken into two stages: The light dependent reactions and the light independent reactions also known as the Calvin Cycle or dark reactions. In the light dependent reactions, Water is oxidized into Oxygen gas by Photosystem II which transports the electrons in through the electron transport chain inside the thylakoid membrane eventually producing high energy molecules like ATP and NADPH. ATP is produced by the enzyme ATP Synthase in a process called Chemiosmosis very similar to cellular respiration. The Calvin Cycle takes in CO2, ATP, and NADPH to produce G3P which is later used to make sugars like Glucose and Fructose.

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[saurishs]

I don't think the video said this (at least I didn't catch it), but during the conversion of the 5G3P back into 3RuBP, it requires the usage of 3ATP -> 3ADP to receive the phosphate group – this is what makes the net count 9 ATP and not 6 ATP.

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[hunterlord]

For anyone stumbling about with this specific part; it's 9 ATP/ADP in the summary due to 6 ATP/ADP forming during reduction and 3 ATP/ADP during regeneration.

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Few days ago I was studying cellular respiration and you uploaded that video and right now I have just completed photosynthesis again you uploaded this video. What is exactly happening? 😂😂

[harriesangelomorales]

Please note that on the last part it should be 12 Nadp+ instead of 6. Thanks for the video.