biology topic 4 - bioenergetics

• what is photosynthesis ?

  the process where plants make their own food
• what is the word equation for photosynthesis ?

  carob dioxide + water - glucose + oxygen
• where does photosynthesis take place ?

  in the leaf
• what are the limiting factors of photosynthesis ?

  temperature, light intensity, carbon dioxide
• photosynthesis - carbon dioxide graph description

  as the rate of carbon dioxide increases, the rate of photosynthesis also increases . after a certain point , increasing carbon dioxide will not have an effect on the rate of photosynthesis as it remains constant
• photosynthesis - light intensity graph description

  as the rate of light intensity increases, the rate of photosynthesis also increases . at a certain light intensity level, the rate of photosynthesis stops increasing and becomes constant
• photosynthesis - temperature graph description

  as the temperature increases, the rate of photosynthesis also increases , therefore the enzymes controlling photosynthesis gain kinetic energy . after a certain level, photosynthesis stops because the enzymes have become denatured
• what is uses of glucose produced by photosynthesis ?

  used for respiration, converted into insoluable starch for storage, used to produce fat or oil for storage, used to produce cellouse and used to produce amino acids for protein synthesis
• what is respiration ?


  the process of making energy from glucose
• what are the 2 types of respiration ?

  aerobic - respiration using oxygen anaerobic - respiration without oxygen
• what is oxygen debt ?

  the amount of oxygen you need to get rid of lactic acid in your body
• what is the oxygen debt repayment word equation ?

  lactic acid + oxygen - carbon dioxide add water
• what does anaerobic respiration produce ?

  lactic acid and energy
• where does respiration take place ?

  mitchondria
• where does anaerobic respiration occur ?

  yeast cells - glucose - ethanol add CO 2
• how do organisms use energy transferred by respiration ?

  keeping warm, movement , chemical reactions to build larger molecules
• what is fermentation ?

  anaerobic respiration in yeast cells
• what happens to the heart and breathing rate during exercise ?

  it increases to supply the muscles with oxygenated blood
• what is metabolism ?


  the sum of all the chemical reactions in the cell or body
• what does metabolism include ?

  • comversion of glucose to starch , glycogen and cellouse respiration the formation of lipid molecules from a molecule of glycerol and 3 molecules of fatty acids