Starch

Question 1

What are the three polysaccharides?

Answer 1

Starch , glycogen and cellulose

Question 2

What is the main role of starch?

Answer 2

Energy scource in many parts of plants

Question 3

How is starch stored?

Answer 3

As small grains that are compact so can be stored in small spaces

Question 4

What is the structure of starch?

Answer 4

-Can be branched or unbranched
-made of chains a glucose monosaccharides that a joined by glycosidic bonds through a condensation reaction

Question 5

Where are the OH groups on a starch molecule?

Answer 5

-point inwards on an a glucose molecule to form hydrogen bonds to keep the helix structure

Question 6

Is starch insoluble or soluble in water?

Answer 6

Starch is insoluble in water so the water potential remains unaffected by osmosis

Question 7

Why is starch good in relation to respiration?

Answer 7

Starch can be hydrolysed into a glucose molecules which can be transported quickly for use of respiration

Question 8

How do enzymes act on starch?

Answer 8

Glucose molecules are released quickly as the unbranched form has many ends that enzymes can act on simultaneously