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Exercises

1 Indicate the correct statements and e- The absorption of nutrients takes place:
correct those who are not 1) In the duodenum

2) In the large intestine
a- Most of the lipids are digested in the
3) In the small intestine
stomach.
4) In all the digestive tract
b- The duodenum secretes the bile and
receives the intestinal juice and the 3 Complex food and simple food
pancreatic juice.
a- Classify into complex or simple food the
c- The salivary amylase digests raw starch
following products:
into maltose.
d- Pepsin doesn’t act except in an acidic Water, salt, glucose, olive oil, meat, milk,
medium. butter, cream, egg’s white, egg yolk, egg,
e- All the nutrients are absorbed by blood. starch.
f- Trypsin digests lipids into fatty acids. b- Choose one of the complex foods and name
g- The Biuret test is used to identify proteins the simple molecules that form it.
and peptides.
h- Fresh cream is a carbohydrate. Measurement of the pH of a
i- The pancreatic juice contains sucrase that 4 solution
allows the digestion of sucrose.
j- A solution of pH = 7 is slightly acidic.

2 Choose the correct answer(s).

a- In the mouth there is :
1) 32 teeth 2) 24 teeth
3) 28 teeth 4) 30 teeth
b- The digestion of sucrose gives :
1) Glucose 2) Maltose
3) Glucose + fructose
4) Glucose + galactose In order to determine the pH of a solution we
c- The gastric juice contains: dip into it a pH indicator. The photo above
1) Lipase + sucrase + protease shows the obtained result.
2) Pepsin a- What is the pH of the solution?
3) Trypsin b- Is it an acidic, a basic or a neutral solution?
4) Amylase + maltase + lipase Justify the answer.
d- The internal medium in formed by:
1) The blood 5 Mineral food and organic food
2) The lymph
3) The contents of the digestive tract An experiment consists of burning food
4) The blood and the lymph. components of different origins. The results
were surprising. After their complete

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