Energy for Life Chapter 4 Section 3 p. 113- 117. A. Cells use Chemical Reactions Cells use chemical reactions to change the chemical energy stored in

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  • Energy for LifeChapter 4 Section 3p. 113- 117

  • A. Cells use Chemical Reactions Cells use chemical reactions to change the chemical energy stored in food into forms needed to perform cell activities

  • A. Cells use Chemical Reactions 1. Metabolism The total of all chemical reactions in an organism

  • A. Cells use Chemical Reactions 2. Chemical reactions require enzymes (which cause, or speed up, or slow down reactions without themselves being changed and therefore can be used again and again.)

  • B. PhotosynthesisThe process that plants and other organisms use to convert sunlight energy into chemical energy or sugars (glucose) to be used as food.

  • B. Photosynthesis1. Producers organisms that make their own foodConsumers organisms that can not make their own food.

  • B. PhotosynthesisChlorophyll and other pigments are used in photosynthesis to capture sunlightWhich is used to produce sugar (glucose) and oxygen

  • C. RespirationThe process in which chemical reactions break down food molecules into simpler substances and release stored energy

  • C. Respiration1. Respiration of carbohydrates begins in the cytoplasm

  • C. Respiration1. Respiration of carbohydrates begins in the cytoplasma. Carbohydrates are broken down into glucose molecules

  • C. Respiration1. Respiration of carbohydrates begins in the cytoplasma. Carbohydrates are broken down into glucose moleculesb. Each glucose molecule is broken down into two simpler molecules, releasing energy.

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  • 2. Respiration moves into the mitochondriaC. Respiration

  • 2. Respiration moves into the mitochondriaa. The two simpler molecules are broken down again, releasing much more energy.C. Respiration+

  • 2. Respiration moves into the mitochondriaa. The two simpler molecules are broken down again, releasing much more energy.b. This process uses oxygen and produces carbon dioxide (CO2) and water as waste products.C. RespirationC6H12O6 + 6O2 6CO2 + 6H2O + energy glucose oxygen carbon water dioxide

  • D. FermentationCells that do not have enough oxygen for respiration use this process to release some of the energy stored in glucose molecules

  • D. FermentationCells that do not have enough oxygen for respiration use this process to release some of the energy stored in glucose molecules1. Entire process occurs in the cytoplasm.

  • D. FermentationCells that do not have enough oxygen for respiration use this process to release some of the energy stored in glucose molecules1. Entire process occurs in the cytoplasm.2. Produces lactic acid, alcohol, and carbon dioxide as wastes

  • E. ComparisonsPhotosynthesis and respiration are almost the opposite of each other.

  • E. ComparisonsPhotosynthesis and respiration are almost the opposite of each other.1. Photosynthesis produces (end products are) glucose and oxygen which are used in respiration6CO2 + 6H2O + energy C6H12O6 + 6O2 carbon water sunlight glucose oxygen dioxide energy

  • E. ComparisonsPhotosynthesis and respiration are almost the opposite of each other.1. Photosynthesis produces (end products are) glucose and oxygen which are used in respiration2. Respiration produces (end products are) carbon dioxide and water, which are used in photosynthesisC6H12O6 + 6O2 6CO2 + 6H2O + energy glucose oxygen carbon water chemical dioxide energy 6CO2 + 6H2O + energy C6H12O6 + 6O2 carbon water sunlight glucose oxygen dioxide energy

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