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2.06 Introduction to Photosynthesis

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on 2 September 2014

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Transcript of 2.06 Introduction to Photosynthesis

2.06 Introduction to Photosynthesis
Cellular respiration and Fermentation
The carbon atom in glucose, during cellular respiration, is split into two pyruvate molecules during glycolysis. The pyruvate is processed into Acetyl CoA. The Acetyl Coa is then oxidized in the citric acid cycle to make two molecules of CO2 per cycle. In fermentation, the glucose, after turning into 2 pyruvate molecules, is instead converted into some waste product lactate in human muscle cells.
Light-Dependent Reaction
The energy-releasing light-dependent reactions of photosynthesis convert light energy into chemical energy; this produces ATP and NADPH. These reactions occur in the stacks of thylakoids of the chloroplasts. The products of the light-dependent reactions, ATP and NADPH, are both required for the energy-requiring light-independent reactions.

Light-Independent Reaction
The energy-requiring light-independent reactions of photosynthesis use the ATP and NADPH synthesized during the energy-releasing light-dependent reactions to provide the energy for the synthesis of glucose and other organic molecules from inorganic carbon dioxide and water. This is done by "fixing" carbon atoms from CO2 to the carbon skeletons of existing organic molecules. These reactions occur in the stroma of the chloroplasts.

Transitioning Between Photosynthesis and Respiration
The carbon dioxide that is, CO2 is split into carbon and oxygen ,the some of the oxygen is released and the carbon is mixed with water that is H20,if you construct and equation for the reaction between carbon and water you will see that the product is glucose that is why we say that during photosynthesis plants take in water and carbon dioxide in order to manufacture their food which is glucose and to release oxygen

By: Ayush Chauhan

BIO Honors

Transfer of Carbon Molecule
The carbon atom is transferred between molecules in various types of ways.The electrons move through a series of electron carrier proteins, called the electron transport chains, within the thylakoid membrane.For every 12 of the resulting three-carbon molecules made, two are removed to build organic compounds and 10 continue on in the cycle. The two three-carbon molecules that are removed bond together, forming a six-carbon sugar such as glucose.Photosynthesis removes carbon dioxide from the atmosphere and releases oxygen gas. Cellular respiration uses oxygen gas and releases carbon dioxide.Yeast and other microorganisms undergo anaerobic alcoholic fermentation. This process produces ethyl alcohol and carbon dioxide. This is used to make dough rise and to make alcoholic beverages.
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