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Chapter 7 Notes

by: Michela Spicer

Chapter 7 Notes BSC 108

Michela Spicer

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About this Document

These notes cover everything regarding to chapter 7 in the textbook.
Intro to Biology Non-Maj
Dr. Yates
Class Notes
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This 2 page Class Notes was uploaded by Michela Spicer on Monday September 26, 2016. The Class Notes belongs to BSC 108 at University of Alabama - Tuscaloosa taught by Dr. Yates in Fall 2016. Since its upload, it has received 9 views. For similar materials see Intro to Biology Non-Maj in Biology at University of Alabama - Tuscaloosa.


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Date Created: 09/26/16
A Photosynthesis Road Map  Photosynthesis is a two-step process oThe light reactions convert solar energy to chemical energy oThe Calvin cycle makes sugar from carbon dioxide  In photosynthesis oEnergized electrons are added to carbon dioxide to make sugar oSunlight provides the energy The Light Reactions: Converting Solar Energy to Chemical Energy  Sunlight is a type of energy called radiation, or electromagnetic energy  The full range of radiation is called the electromagnetic spectrum  Chloroplasts absorb light energy and convert it to chemical energy Chloroplast Pigments  Chloroplasts contain several pigments oChlorophyll a oChlorophyll b oCarotenoids How Photosystems Harvest Light Energy  Light behaves as photons- discrete packets of energy  Chlorophyll molecules absorb photons oElectrons in the pigment gain energy o As the electrons fall back to their ground state, energy is released as heat or light  A photosystem is a group of chlorophyll and other molecules that function as a light-gathering antenna How the Light Reactions Generate ATP and NADPH  Two types of photosystems cooperate in the light reactions 1)The water-splitting photosystem 2)The NADP-producing photosystem  An electron transport chain: oConnects the two photosystems oReleases energy that the chloroplast uses to make ATP The Calvin Cycle: Making Sugar from Carbon Dioxide  The Calvin Cycle oFunctions like a sugar factory within a chloroplast oRegenerates the starting material with each turn  G3P sugar oMakes the Calvin Cycle turn, makes RuBP sugar oOne of the G3P sugars will come out of the cycle and make glucose Water-Saving Adaptations of C 4 and CAM Plants  C3 plants oUse CO directly from the air 2 oAre very common and widely distributed  C4 plants oClose their stomata to save water during hot and dry weather oCan still carry out photosynthesis  CAM plants oOpen their stomata only at night to conserve water Photosynthesis has an enormous impact on the atmosphere  It swaps O for CO 2 2 How Photosynthesis Moderates the Greenhouse Effect  Old-growth forests oAre important for lumber oAre important for moderating world climates  The Greenhouse effect oWarms the atmosphere oIs caused by atmospheric CO 2 o Greenhouse gases are the most likely cause of global warming, a slow but steady rise in the Earth’s surface temperature  Destruction of forests may be increasing this effect


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