Botany Chapter 10

Botany Chapter 10 - Chapter 10 Plant Metabolism Metabolism...

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1 Chapter 10: Plant Metabolism ± Sum of all the chemical activities in an organism ± ± Complex molecules synthesized from simpler substances ± Photosynthesis ± ± Larger molecules broken down into smaller ones ± Respiration ± Reactants (substrates) Æ Products Metabolism ± ± Substance gives up energy/electrons ± ± Substance receives energy/electrons ± Occur simultaneously ± Essential part of cellular respiration, photosynthesis, and other chemical reactions ± Electron acceptors ± When reduced temporarily stores large amounts of energy ± NAD + ± NADP + ± FAD ± Move electrons in an electron transport chain Redox reactions
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2 ± ± Regulate the rate of chemical reactions ± Example: Catalase ± Lower activation energy (E A ) ± energy required to break existing bonds ± Can only promote a reaction that can proceed without it Enzymes ± ± Releases energy that can perform work (downhill) ± coupled reaction ± Exergonic reaction provides energy for an endergonic reaction ± Energy is necessary for the endergonic reaction ± Linked by a common intermediate ± ± Increases free energy/requires energy Reactions ± Adenosine triphosphate ± Energy currency of the cell ± Common link between exergonic and endergonic reactions
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3 1772- Joseph Priestly Photosynthesis (P s ) ± What? ± Conversion of sunlight into chemical ENERGY ± Who? Autotrophs (“self-nourishing”) ± ± some bacteria and protista ± When and How? ± ± Carbon dioxide (CO 2 ) ± Water (H 2 O) Overall… (redox reaction) 6CO 6CO 2 + 12H + 12H 2 O + O + Light Light Æ C 6 H 12 12 O 6 + 6O + 6O 2 +6 +6 H 2 O In summary… CO 2 O 2 H 2 O SUGAR 6CO 6CO 2 + 12H + 12H 2 O + O + Light Light Æ C 6 H 12 12 O 6 + 6O + 6O 2 +6 +6 H 2 O
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The nature of light ± RADIATION = ENERGY ± Light acts like a particle and is in a unit called a photon ± All solar radiation travels at a constant speed ± Wavelength is the difference between photons! ± Different wavelengths have different characteristic energies and properties Why is it important? © Copyright 2003. The Flying Turtle Company. Plants photosynthesize to live… …We eat to live… Carbon Dioxide ± Carbon dioxide reaches cholorplasts in the mesophyll cells by diffusing through the stomata into the leaf interior. ± Use of fossil fuels, deforestation, and other human activities have added excess carbon dioxide to the atmosphere. ± ² Plants may counter-balance by developing fewer stomata.
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Botany Chapter 10 - Chapter 10 Plant Metabolism Metabolism...

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