Page 33 - exemple

Exercises

after 2 hours

Results

Tube 1 The small pieces of fish disappear.

Tube 2 The large piece of fish becomes smaller.

a- What is the posed problem by the student?
b- Indicate the variable factor in this experiment.
c- Is the posed problem solved? Justify the answer by using the information provided by the
above document.

12 Digestion of a lipid: olive oil

The adjacent document N° of Result
experiment Experiment (1 hour later)
summarizes the conditions of
o
T = 37 C
in vitro digestion of olive oil
(lipids) and the results 1
Tube oil
obtained after one hour. layer
Water + oil
a- Describe experiment 1 Legend:
Put water
(adjacent document). T: Strong mixing
b- Analyze the two temperature
experiments 1 and 2. T = 37 C
o
Derive the role of bile.
Bile
c- Analyze the two 2 + oil drops
experiments 2 and 3. Water + oil dispersed
in water
Derive the role of
Strong mixing
pancreatic juice.
o
Lebanese Brevet 2008 T = 37 C
Oil
+
3 Faty acids
Water + bile and
+ glycerol
Pancreatic juice
Strong mixing
13 Digestion of sucrose

Document 1
Sucrase is an intestinal enzyme that acts on sucrose
(double sugar) and permits its digestion. Legends:
Put
To verify this hypothesis, we perform an in vitro
digestion of sucrose as follows : Add
- We put 5 ml of sucrose solution in each of two test Place
tubes A and B. Test Water bath
- We add a very small quantity of sucrase enzyme to

Digestion 37