3.1.2.4 Polysaccharide Structure, Function and the Starch Test

Question 1

How is the structure of cellulose suited to its function?

Answer 1

Beta Glucose molecules can form long straight chains

Parallel chains of cellulose form hydrogen bond “cross links” which ass strength

Cellulose is arranged into microfibrils and then fibers, which add more strength

Question 2

Which type of bond forms between adjacent alpha-glucose molecules in glycogen

Answer 2

Alpha 1-4 glycosidic bonds

Question 3

Ubranched starch (amylose) coils into a…

Answer 3

compact helix structure

Question 4

Which type of bond forms between branching alpha-glucose molecules in glycogen?

Answer 4

Alpha 1-6 glycosidic bonds

Question 5

What test is described below:

1. Place 2cm3 of the sample being tested into a test tube
2. Add 2 drops of iodine solution
3. A black colouration indicates a positive result

Answer 5

The test for starch

Question 6

What form does starch take within plant cells?

Answer 6

Starch grains

Question 7

Which type of bond forms between unbranched starch (amylose) molecules

Answer 7

Alpha 1-4 glycosidic bonds

Question 8

How is glycogen different to starch?

Answer 8

Glycogen has many more branches

Question 9

What type of reaction occurs when monosaccharides join?

Answer 9

Condensation reaction

Question 10

Which type of organisms contains starch?

Answer 10

Plants

Question 11

What form does glycogen take in cells?

Answer 11

Granules within muscle and liver cells

Question 12

How would you test for starch?

Answer 12

1. Place 2cm3 of the sample being tested into a test tube
2. Add 2 drops of iodine solution
3. A black colouration indicates a positive result

Question 13

Cellulose microfibrils are grouped and arranged in parallel groups called…

Answer 13

Fibres

Question 14

Which monosaccharide is cellulose made from?

Answer 14

Beta glucose