Carbohydrates-disaccharides

Question 1

How is a disaccharide formed?

Answer 1

formed when two
monosaccharide molecules are joined by a glycosidic bond via a condensation reaction: Two OH groups line up next to each other which removes a H20 molecule, which leaves an O atom=glycosidic bond.

Question 2

what type of bond is a glycosidic bond

Answer 2

It is a covalent bond

Question 3

What is the disaccharide sucrose(reducing
table sugar) made of?

Answer 3

fructose and alpha glucose which gives sucrose 1-4 alpha glycosidic bonds.

Question 4

what is the disaccharide
lactose(milk sugar)
made of?

Answer 4

Galactose and beta glucose which gives lactose 1-4 beta glycosidic bonds

Question 5

what is the disaccharide
maltose(malt sugar)
made of?

Answer 5

alpha and alpha glucose which gives maltose alpha 1-4 glycosidic bonds

Question 6

what is the disaccharide
cellobiose made of?

Answer 6

beta and beta glucose which gives cellobiose
1-4 beta glycosidic bonding

Question 7

How are disaccharides broken down?

Answer 7

via a hydrolysis reaction which breaks them down into two monosaccharides, the addition of water(provides an -OH group and a H atom) is required to break the glycosidic bond.

Question 8

Draw the condensation and hydrolysis of Maltose

Question 9

Whats a glycosidic bond

Answer 9

A bond formed between two monosaccharides in a condensation reaction