• Created by: benitaxx
  • Created on: 18-02-18 17:22
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  • Bioenergetics
    • Photosynthesis
      • Photosynthesis is needed for growth of plants
      • To produce glucose molecules energy is needed
        • The reactions are endothermic and the energy is supplied by sunlight
        • Chlorophyll, found in chloroplasts trap the energy
      • Factors affecting phtosynthesis
        • Temperature
          • As temperature increases so doe the rate of photosynthesis
            • Because more energy is being put in
          • Rate drops to zero at 45 degrees because enzymes are destroyed
        • CO2 concentration
          • As CO2 concentration increases, so does the rate of photosynthesis
            • Because more energy is provided for reaction
          • After a certain point, the CO2 is no longer the limiting factor
        • Light intensity
          • As light intensity increases, so does the rate of photosynthesis
            • Because more energy is provided for reaction
          • After a certain point, light intensity is no longer the limiting factor
      • Converting glucose
        • into insoluble starch stored in stem, leaves or roots
        • Fat or oil stored in seeds
        • Cellulose to strengthen cell walls
        • Proteins used for growth
      • Required Practical
        • Put pond weed into beaker and put a light over it. Move the light closer and closer, counting the bubbles produced for a minute, each time it's mpved
          • More bubbles produced, higher rate of photosynthesis because light intensity is increased
            • Doubling distance between lamp and pond weed will reduce light intensity by a quarter- inverse square law
    • Respiration and excersise
      • Respiration is an exothermic reaction
      • Aerobic respiration
        • With oxygen
        • Glucose+ Oxygen= Carbon dioxide+ water
      • Anaerobic respiration
        • Without oxygen
        • Glucose is no all broken down
        • In animals: Glucose= lactic acid
        • In plants and yeast: Glucose= Ethanol and carbon dioxide
        • In yeast cells it's called fermentation and is used in making bread and alcoholic drinks
      • Metabolism
        • Sum of chemical reactions in cell or body
        • reactions controlled by enzymes and need transfer of energy
        • Energy from respiration is used to:
          • Glucose to starch, glycogen and Cellulose
          • Making lipid molecules from a ,molecule of glycerol and 3 molecules of fatty acids
          • use of glucose and nitrate ions to make amino acids
          • Breakdown of excess proteins into urea for excretion
      • Exercise
        • Body demands more energy so respiration needs to increase
        • If in exercise the muscles dont get enough oxygen, lactic acid is produced and  oxygen debt occurs
          • Lactic acid causes the muscles to hurt and prevents them functioning efficiently
          • Once exercise is finished, oxygen debt must be repaired
        • Blood transports lactic acid to liver where it's broken down after excersise




For temperature on the photosynthesis' side, wouldn't the enzymes get denatured rather than destroyed?

Because the active site changes shape as it exceeds/reaches the optimum temperature.



fia777, you are right

Also I know I replied a bit late (sorry)

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