Carb digestion

Question 1

What is the composition of starch?

Answer 1

made up of 2 polysaccharides:
- amylose (Straight chain)
- amylopectin (branched chain)
Insoluble in water

Question 2

What are the main classes of polysaccharide?

Answer 2

Starch - from plants
Glycogen - animals

Question 3

Describe the composition of glycogen

Answer 3

single, highly branched polysaccharide
soluble in water as it is branched

Question 4

How are disaccharides and monosaccharides formed?

Answer 4

Sucrose = glucose + fructose
Lactose = glucose + galactose
Maltose = glucose + glucose
Formed in condensation reactions between 2 monosaccharides
Monosaccharides formed by hydrolysis of disaccharides

Question 5

Describe carbohydrate digestion

Answer 5

Salivary a-amylase begins starch digestion to maltose, some glucose and dextrins
Pancreatic amylase continues starch breakdown into maltose in SI
glucosidae enzymes in brush border of intestines breakdown disaccharides into monosaccharides to be transported into intestinal mucosa