Disaccharides and polysaccharides

Question 1

What are bonds between monosaccharides called

Answer 1

Glycosidic bonds

Question 2

How do you test for non reducing sugars

Answer 2

Do the Benedict’s test, if negative get another smaple, add dilute hydrochloric acid and heat, this will hydrolyse the polysaccharides and disaccharides into monosaccharides and then add sodium hydrogencarbonate to neutralise it, and then redo the Benedict’s test, and if it is positive, the sample had non reducing sugars

Question 3

How do you turn a monosaccharide into a polysaccharide

Answer 3

Condensation reactions will create disaccharides, and then if you repeat this you will get polysaccharides

Question 4

What uses are there for polysaccharides

Answer 4

storage of energy, and structural integrity

Question 5

What is starch made of?

Answer 5

Alpha glucose

Question 6

How do you test for starch

Answer 6

add potassium ioidide, if negative it will be yellow, if positive, blue/black