respiration quiz

• what is cellular respiration

  an exothermic reaction which is continuously occurring in cells
• 3 ways organisms use their energy?

  build larger molecules from smaller molecules(e.g combining amino acids to form protein)

  muscular contract-so we can move about

  maintain body temperature-to stay warm
• what is metabolism?


  the combination of all reactions
• aerobic respiration


  takes place when there is enough oxygen

  takes place in plants and animals(mainly:mitochondria)
• anaerobic respiration


  respiration without oxygen

  can't get enough oxygen to keep up with aerobic respiration

  glucose----> lactic acid
• why do we not prefer to use anaerobic respiration?

  incomplete breakdown of glucose molecule(no oxygen to oxidise)-not unlocking all of the energy in the glucose molecule.

  lactic acid builds up and has to be removed later
• anaerobic respiration in plants and yeast?

  the glucose is converted to ethanol and carbon dioxide instead of lactic acid

  in the terms of yeast we call this process fermentation