Bio - Chap 7

Bio - Chap 7 - d Chlorophyll A is the most common-Reflects...

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Sheet1 Page 1 Lecture 7a: Photosynthesis The energy used by organisms originally derives from the sun as sunlight Energy travels in waves and is measured based on its wavelength Photons are packets of energy that contain a certain amount of energy -The shorter the wavelength, the more energy the photon contains Radient energy can be categorized based on the wavelengths they travel This categorization is the electomagnetic spectrum: -In includes the "visible" spectrum we see as colors ->Violet (380nm) to red (750nm) is visible nm = nanometers Pigments are molecules that can absorb certain wavelengths of light -The light they do not absorb (i.e. reflect) is the color we see -The light-catching part of a pigment is usually an alternation of single and double bonded atoms -The electrons that make up the bonds are excited (or moved) to the next energy level because of -the energy input, but imme
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Unformatted text preview: d Chlorophyll A is the most common-Reflects green and yellow light Chlorophyll B is the most common accessory pigment-reflects green and blue light Carotenoids reflect red, orange, and yellow light Xanthophylls are a type of carotenoid-Reflects yellow and blue light *Anthocyanins reflect read and purple light *Phycobilins reflect red and blue-green light Shorter wavelength = more energy, more purple-ish Longer wavelength = less energy, more red-ish Photosynthesis occurs in two main stages:-Light-dependant reactions->Make ATP from sunlight-Light-INdependant reactions->make sugar from ATP Photosynthesis occurs in the chloroplasts in plants Water and CO2 go in = Water, oxygen and sugar come out of plants...
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