| Author | Message | ||
     991097 Username: 991097 Registered: 04-2003 |
In the experiment of the fermentation of glucose by yeast,we always add a layer of oil over the glucose solution to prevent oxygen or air from dissolving into the solution. But how can the gases in the solution comes out(during respiration)? | ||
| 喵喵喵喵喵喵喵喵喵.... yan~* Username: 991160 Registered: 04-2003 |
i want to ask a question too. in the experiment which to show anaerobic respiration in germinating seeds, if the question ask, is the paraffin oil in the experiment can be replaced by water? how to answer this question. or in other words to say, why should use paraffin oil instead of water? | ||
| Bati Bond Username: 971067 Registered: 04-2003 |
Is the paraffin oil in the experiment can be replaced by water? The answer should be No because oxygen dissolves in water but not in paraffin oil. So result obtained can be deduced as totally come from the seeds undergoing anaerobic respiration but not performing aerobic one. If water is used, oxygen can dissolve in it and the result obtained cannot be defined as the result of anaerobic respiration. | ||
| 991035 Username: 991035 Registered: 04-2003 |
The air pressure under the oil layer is more higher than outside because of the anaerobic respiration of the yeast. so the CO2 will come out becuase of the air pressure is so large! |