Meat was placed in three test tubes. One test tube contains pepsin, one contains hydrochloric acid, and the other contains a mixture of hydrochloric acid and pepsin. The test tubes were heated to body temperature and allowed to sit. Observe the test tubes and answer the questions in your lab report.
1. Rank the test tubes in order of greatest amount of digestion to least amount of digestion. For each tube, explain why it would have exhibited that level of digestion.
2. How could the experiment be modified to further test human digestion actions? What variables would you change? What would you keep the same?
3. In which test tube was the activity most like that of a real human stomach? Explain.
Answers
Answer:
2 is the answer of question
Answers for meat digestion are given below:
Meat is protein rich diet and hence it's digestion will occur accordingly.
1. Test tube containing HCl and pepsin will give maximum digestion, then pepsin then HCl.
HCl and pepsin will digest meat in combination hence greater effect.
Pepsin is protein digestive enzyme and hence it will have greater effect than HCl.
2. To completely replicate human digestive system in protein digestion, other enzymes have to be added.
Those enzymes are - trypsin, chymotrypsin, aminopeptidase and carboxypeptidase. Combination of HCl and pepsin will remain same. Pepsinogen too can be added.
3. Combination of HCl and pepsin in test tube, replicates conditions of human stomach effectively as stomach contains HCl and pepsinogen. Pepsinogen is activated by HCl into pepsin there.