Carbohydrates - Disaccharides and Polysaccharides

Question 1

How do monosaccharides link together to form disaccharides?

Answer 1

-Two monosaccharides undergo a condensation reaction forming a glycosidic bond.
-Glucose + Glucose -> Maltose
-Glucose + Fructose -> Sucrose
-Glucose + Galactose -> Lactose

Question 2

How do alpha glucose molecules link together to form starch?

Answer 2

-Alpha glucose molecules bond together forming glycosidic bonds.

Question 3

What is the test for starch?

Answer 3

-Place 2cm^3 of the sample being tested into a test tube.
-Add two drops of iodine solution and shake or stir.
-The presence of starch is indicated by a blue-black coloration.