Slides in this set
· These are single unit sugar molecules:
· With Edexcel, you do not need to know their chemical structure i.
e. the complex hexagonal diagrams.
· Just remember:
· In the exam, if it questions states to name a monosaccharide found
in food, do not put Galactose because it is only found in breast
· These are double unit sugar molecules
· When you combine:
Glucose + Glucose = Maltose
Glucose + Fructose = Sucrose
Glucose + Galactose = Lactose
· Again, you do not need to know how these molecules combine, you
just need to remember which ones go with which.…read more
· These type of carbohydrates can be subdivided
complex and simple polysaccharides.
· Simple polysaccharides consist of long chains of
one type of monosaccharide; in this case the
monosaccharide is always glucose.
· Complex polysaccharides are long chains which
contain a combination of different
· Amylose and Amylopectin
Amylose is a long chain of glucose molecules.
· Flour naturally contains amylose.
It is broken down by the enzyme amylase, which is naturally
found in our saliva.
Amylopectin's structure, on the other hand, is branched.
Although, you do not need to know how these polysaccharides are
formed, just remember that these are held together by alpha links.…read more
Glycogen and Cellulose
Glycogen has a similar structure to amylopectin.
Glycogen is the human storage of starch, which gives our body
a supply of instant energy.
Cellulose has a similar structure to amylose.
It supplies us with fibre or NSP (Non Starch Polysaccharide).
NSP absorbs water in our body, making digestion of food easier.
The chains are held by beta links.
· Therefore, it is not starch because amylose is held by alpha
links, although the two structures lookalike.…read more