Biology Digestion Ia - 1380 Words

Biology Digestion IA 13/03/2013 Jason Gao Rationale: Digestion is the chemical breakdown of food into smaller components that are more easily absorbed. Digestion is a form of catabolism: a breakdown of large food molecules to smaller ones. When food enters into stomach, gastric juice starts protein digestion. Gastric juice mainly contains hydrochloric acid and pepsin. The pH value of hydrochloric in the stomach is 2, as the activity of pepsin is optimal, while it will lose its activity at pH 6.5 and above. However, pepsin will regain its activity at pH of 8. In the range of pH1 to pH6.5, pepsin will be most active at pH2, and starts to decrease its†¦show more content†¦And it has a lowest activity at 0M that is water. While the activity is a little bit higher at 0.2M than 0.05M, and the activity is la little bit lower at 0.3M than 0.05M. Besides, the activity at o.4M is only higher than water, which is 0M. Therefore, it can be summed that at an optimal point, protease enzyme pepsin can work most actively. Conclusion: In conclusion, the results of this experiment indicate that the optimum concentration of hydrochloride solution for pepsin with highest activity is 0.1M. While at the lower concentration like 0M and 0.05M or higher concentration like 0.2M, 0.3M and 0.4M, pepsin has a lower activity. This shows that the protease enzyme has a particular relationship with hydrochloride solution. Also, it answers the research question, which the activity of protease enzyme will be affected by the concentration of hydrochloride solution. That is the activity of pepsin rises at first until reach an optimal point, which is 0.1M. After the point, the activity begins to fall. Its graph is like the relationship between activity of enzyme and pH value, which is showed blew. Therefore, it can be concluded that the concentration of hydrochloride solution also indicates the pH value of the solution. Consequently, 0.1M of hydrochloride solution is optimal for pepsin’s activity. Evaluation: Aspect | Limitation | Improvements | Time | As the time is not much, these data had been only collected for oneShow MoreRelatedEssay about Placental Ruminants and Herbivorous Marsupials of Australia3561 Words   |  15 Pagesdue to the harsh and distinctive environment found on the continent. The major area of marsupial biology that distinguishes them from all other eutherian mammals is their mode of reproduction. However, it can be said that there are many other areas in which unique differences can be seen between marsupials and eutherian mammals; one such area of adaptation is in the anatomy and physiology of digestion, which distinguishes them from many other similar animals worldwide. 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