Reference no: EM132394523

Lab - Food Chemistry & Digestion (Little Miss Muffet lab)

Read the background information about separating milk. Then, perform the actual lab activity to separate milk yourself. Take a picture of your experiment and your results to submit. Next, follow the link to the virtual lab for testing for the presence of macromolecules in food. Follow the steps in the lab handout and run the different tests and analyze the hypothetical test results from your separated milk. Answer the questions at the end of the lab handout and submit with your experiment photo.

Lab Activity: Separate Skim Milk and Whole Milk into Curds and Whey.

Answer these questions:

1. What does Iodine test for and what color indicates the strongest positive test?

2. What does the Biuret reagent test for and what color indicates the strongest positive test?

3. What does the Benedict reagent test for and what color indicates the strongest positive test?

4. What does the Sudan III stain test for and what color indicates the strongest positive test?

5. What would be a good negative control for all of these tests (same for all tests)?

6. What would be a good positive control food for each of these tests (different for each test)?

7. Why do we use a negative control?

8. Why do we use a positive control?

Circle the correct answer/answers or leave blank if no correct answers:

9. Is there sugar in whole milk? yes no

10. When you separate milk into whey and curds, where is the sugar? whey curds

11. Is there starch in whole milk? yes no

12. When you separate milk into whey and curds, where is the starch? whey curds

13. Are there lipids in whole milk? yes no

14. When you separate milk into whey and curds, where are the lipids? whey curds

15. Is there protein in whole milk? yes no

16. When you separate milk into whey and curds, where is the protein? whey curds

17. Which contains more protein? whey curds

18. Which of the 4 macromolecules are found in whole milk?

19. Which of the 4 macromolecules are found in cheese?

20. Traditionally, whey was considered a waste product of cheese production, although farmers would often feed it to their pigs. Search the internet and list a few ways whey is used now so that it isn't wasted.

21. Animal rennet works best from 85 - 105 degrees Farenheit (29 - 41 degrees Celcius) and also works best in an acid (low pH) environment. Why? (Think about where it comes from).

22. Why do we get animal rennet from calf stomachs? (What is it about them that causes it to work?)

23. Did you produce more curds from skim or whole milk? What caused the difference in curd yields?

24. Were there any other differences in the curds produced from skim versus whole milk?

Attachment:- Little Miss Muffet Lab.rar