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EIS Teaching – Learning Strategies / Procedures
Biology Secondary 4, duration 60 min.
Teacher: Mr.Wichai Likitponrak
Look at this Picture!
What is
This?
Carbohydrates
Carbohydrates Contain the Elements:
Carbon
Hydrogen
Oxygen
They Are Split Into Three Groups Known As:
Monosaccharides(Monomers)
Disaccharides(Dimers)
Polsaccharides(Polymers)
Carbohydrates
•Many carbohydrates are soluble in water.
•The usual chemical test for the simpler
carbohydrates is heating with Benedicts solution.
•The formula for a carbohydrate is (CH2O)n
•The n represents the number of times the CH2O
unite is repeated.
Benedicts Test
Monosaccharides(monos) The Most Important Monosaccharide Is
Glucose.
A Monosaccharide is made up of 1 sugar unit.
Monos are reducing sugars.
Fructose and Galactose are all so
Monosaccharides, They all have the same chemical
formula but different structures.
Three Monosaccharides
C6H12O6 Hexose ; n=6
Disaccharide : Glycosidic Bond
This is when two monosaccharides join to form a Disaccharide.
The reaction is similar to condensation.
The reaction involves the water been given off.
There are three types of Disaccharides:
1. Sucrose
2. Lactose
3. Maltose
Glycosidic Bond
Above is the
structures of a
Glycosidic bond.
It forms a
Disaccharide
Dehydration Synthesis
of a Disaccharide
Formation of Disaccharides
Hydrolysis
This is the breaking down of a glycosidic bond.
Instead of water been taken away water is added.
Lysis means splitting.
Hydrolysis of a Disaccharide
Important Polysaccharides: Starch
Consists of glucose subunits Plant energy storage molecule Glycogen is a very similar molecule in animals. Starch and glycogen can be digested by animals.
Starch test
Important Polysaccharides: Cellulose Composed of glucose subunits
Different bond formed than starch
Structural component in plants
Cannot be digested by animals
Review by this VDO!!!
http://www.youtube.com/watch?v=_zm_DyD6FJ0
Your Group Activity.
Your Group Result.
SAMPLE TEST RESULT
Starch Non Starch
Ex. Potato
A
B
C
D
E
Assignment:
Worksheet
1.1
1.2
1.3
Sent me back
in this class !!!
THANK YOU FOR YOU
ATTENTION !!!