Description of Photosynthesis and Respiration

Topics: Cellular respiration, Photosynthesis, Adenosine triphosphate Pages: 3 (824 words) Published: March 14, 2011
1. Explain how photosynthesis and respiration are linked in order to provide you with energy from the food you eat.

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•Complete descriptions of photosynthesis and aerobic respiration. •Describe how these two processes are linked between plants and animals based on the reactants and products (water, carbon dioxide, glucose and oxygen) of both pathways. •Include a description of how energy is transferred from sunlight to ATP, from ATP to sugars, and from sugars to your cells. Photosynthesis is the process whereby plants utilize C02, H2O and Sunlight to create food in the form of a sugar called glucose. As a byproduct of this reaction, the plants also release oxygen. Respiration is the process where cells use glucose, to release stored energy. In the process, cells release CO2. Photosynthesis takes place in Chloroplasts which are found mostly in the plant leaves. Chloroplasts are organelles composed of a phospholipid inner and outer membrane. Between these 2 membranes is an intramembranous space. Inside the inner membrane is a fluid called the stroma which contains thylakoids, where photosynthesis takes place. The thylakoids are shaped like pancakes and are bounded by a membrane. Photosynthesis takes place on the thylakoid membrane. The thylakoid membrane has proteins embedded in it. The pigment chlorophyll is embedded in specialized proteins within the thylakoid membrane. Chlorophyll absorbs red and blue light, but not green. This is what gives plants their green color. When light strikes chlorophyll, it absorbs one photon and loses one electron. The electron is now in a higher state of potential energy and is unstable. This electron is passed down a chain of modified chlorophyll molecules creating an electron transport chain. The electron is passed to NADP, reducing it to NADPH. The energy released by reducing the potential energy of the electron is used by enzymes to pump hydrogen atoms inside the membrane....
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