Carbohydrates

Question 1

What kind of isomer are beta glucose and alpha glucose?

Answer 1

Anomers

Question 2

Monosaccharides and disaccharides all react with Benedict’s solution except which sugar?

Answer 2

Sucrose

Question 3

What reacts with iodine to give a blue black colour?

Answer 3

Starch

Question 4

What can monosaccharides and polysaccharides be classed as?

Answer 4

Simple sugars

Question 5

How do we hydrolyse (addition of water) starch and sucrose to glucose or glucose/fructose?

Answer 5

Heat with hydrochloric acid

Question 6

Name three polysaccharides

Answer 6

Starch, cellulose, glycogen

Question 7

What is the name of the bond formed between monosaccharides?

Answer 7

O-Glycosidic bonds/linkages

Question 8

What type of reaction occurs between monosaccharides to form disaccharides or polysaccharides?

Answer 8

Condensation reaction aka dehydration

Question 9

Starch exists in two forms. What are these?

Answer 9

Amylopection and amylose

Question 10

Describe the structural differences between amylopectin and amylose

Answer 10

Amylose is a linear straight chain molecule with 1-4 linkages between each monomer unit. Amylopectin is branched due having to carbon 1-6 linkages along its 1-4 linked straight chain

Question 11

When and how can glucose react with Benedict’s solution?

Answer 11

In solution…

because it produces a small part of it’s chain containing an aldehyde group, and that part can react