NAME & section #:
PRELAB EXERCISE 7 (2002-2003)
DIGESTION
(Seeley 36, 43-49, 896-901)
1. Define "chemical digestion" (Seeley p. 896)
2. What is the name of the type of chemical reaction by which complex food molecules are
broken down to simple molecules? Write this reaction using general symbols (Seeley p.36).
3. Define the following (Seeley p. 34, 49):
Enzyme:
Substrate or reactant:
Enzyme-substrate complex:
Product:
4. Proteins are denatured when ambient pH changes from optimal values. Explain.
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5. Enzymes are proteins. Do you think that any changes of pH from their optimum physiological
values will affect the efficiency of their actions? Explain.
6. Distinguish between bile, bile salts, bile pigments. In point form briefly compare sources,
composition and functions.
7. On a separate page, using simple diagrams (similar to Seeley Fig.24.4) summarize the processes of chemical digestion and absorption of the following macromolecules:
a. Proteins
b. Carbohydrates
c. Lipids
DETAILS OF THESE PROCESSES WILL BE STUDIED IN LECTURES
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