bio 11-8-06 - produce NADPH the light dependent reactions...

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Pigments - chlorophyll a is the main pigment that absorbs light in photosynthesis - chlorophyll b absorbs light at slightly different wavelengths than chlorophyll a and can transfer the light energy to chlorophyll a - carotenoids are a group of pigments that can capture violet to blue-green light and pass the energy on to a special chlorophyll a in a reaction center – called accessory pigments Photosynthesis - two sets of reactions: light-dependent and light-independent - light-dependent reactions capture light energy and convert it to chemical energy - happens in the thylakoid membranes - light energy is captured by the pigments and passed on to chlorophyll a - this light energy excites an electron which is passed to electron acceptor - the missing electron is replaced by an electron from water and oxygen in the waste product released into the atmosphere there are 2 photosystems; I and II an electron transport system takes the excited electron from phtosystem II and uses it to produce ATP another electron transport system takes an excited electron from photosytem I and uses it to
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Unformatted text preview: produce NADPH the light dependent reactions are stepping stones to the end goal of photosynthesis which is the production of sugar ATP and NADPH are used to power the synthesis of glucose in the light-independent reactions otherwise known as the Calvin cycle Photosynthesis If it gets too hot, plants close their stomates to conserve water This results in carbon dioxide not being able to enter and oxygen nto being able to leave Carbon dioxide is used to make sugar, so its levels decline Oxygen builds up With carbon dioxide levels declining the calvin cycle is lsowed down or stopped To make matters worse, rubisco is also an oxidase, so it can bind oxygen instead of carbon dioxide which it adds to the calvin cycle instead of carbon dioxide The product splits and produces carbon dioxide (like respiration_) but no ATP Because it occurs in the light and consumes oxygen, this process is called photorespiration...
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