Carbs

Question 1

How do you test for a reducing sugar?

Answer 1

Add test solution + equal parts of Benedict’s reagent to boiling tube

Heat to 80°c

Observe for a colour change from blue to brick red for positive result

Question 2

How do you test for a non-reducing sugar?

Answer 2

Boil test solution with hydrochloric acid

Neutralise with sodium hydrogen carbonate

Do Benedict’s test

Observe for a colour change from blue to brick red for positive result

Question 3

Name the bond between 2 monosaccharides

Answer 3

Glycosidic bond

Question 4

What type of reaction forms a glycosidic bond?

Answer 4

Condensation reaction

Question 5

Name monosaccharides in maltose

Answer 5

Glucose + glucose

Question 6

Name monosaccharides in sucrose

Answer 6

Glucose + fructose

Question 7

Name monosaccharides in lactose

Answer 7

Glucose + galactose

Question 8

What type of reaction occurs to break disaccharides into monosaccharides?

Answer 8

Hydrolysis

Question 9

What is the monomer of cellulose?

Answer 9

Beta glucose

Question 10

What 2 polymers form starch?

Answer 10

amylose + amylopectin

Question 11

What is the polymer used as storage in animals?

Answer 11

Glycogen

Question 12

What polymer is used as storage in plants?

Answer 12

Starch

Question 13

How cellulose is well suited for its function?

Answer 13

Long + straight chains linked by many hydrogen bonds = microfibrils

Question 14

Give 4 properties of polysaccharides that make it suited for storage

Answer 14

Insoluble

Branched

Coiled

Large

Compact