Page 20 - exemple

Doc 2-
N.B: The hydrolysis of a
1- Salivary substance means its
amylase is a
digestive decomposition by water.
Starch = macromolecule enzyme
formed by many
molecules of glucose
linked together

2- Hydrolysis: In the presence of
water, the amylase breaks the
bond that links two glucose
molecules.

Enzyme: salivary amylase
3- The molecular simplification: The
Molecule of glucose starch molecule is fragmented into
simpler carbohydrate molecules
Molecule of maltose =
2 molecules of glucose (maltose)

2 Digestion of proteins

Place fragments of coagulated egg white in 2 test tubes 1 and 2.
Pour a small quantity of water and hydrochloric acid in both tubes. Place the tubes in a water bath

at 37°C. Add commercial pepsin to the
content of test tube 1.

Fragment of a
molecule of albumin
insoluble in water
1 2
Coagulated egg
white + HCl +
pepsin Water
at In the
37°C stomach Hydrolysis reaction
Coagulated egg favored by pepsin
white + HCl
1 hour later

Result: the content
of tube 1 became 1 2 Molecules of
clear polypeptides
soluble in
Water water
at
37°C

Doc 3- Experiment showing the digestion of Doc 4- Digestion of albumin by pepsin found
proteins. in the gastric juice.

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