QP Carbohydrates

Question 1

Assess the relative importance of carbohydrates to plants and animals. (9)

Answer 1

Question 2

Answer 2

Question 3

The fatty acids shown on the diagram are saturated.
Describe how the diagram would be different if one of the fatty acids was unsaturated.
(2)

Answer 3

FATTY ACID CHAIN

Question 4

Describe how glucose moves into cells by facilitated diffusion.
(2)

Answer 4

Question 5

Explain how the structure of glycogen allows it to be an energy store. (3)

Answer 5

Question 6

Describe the reaction that joins two α-glucose molecules to form a disaccharide.
(2)

Answer 6

Question 7

Give one structural difference between amylose and amylopectin.
(1)

Answer 7

Question 8

Compare and contrast the structures of trehalose and maltose. (2)

Answer 8

Question 9

Explain how the structures of amylopectin and glycogen make them suitable for storing
energy.
(3)

Answer 9

Question 10

Insect flight uses a lot of energy. Explain the advantage of insects storing both trehalose
and glycogen.
(4)

Answer 10

Question 11

Answer 11

tri = staurated fat

Question 12

Draw the two monosaccharides that are produced when a molecule of sucrose is broken
down.
(2)

Answer 12

Question 13

Monosaccharides join to form disaccharides and polysaccharides.
Compare and contrast the structure of a disaccharide with glycogen.
(4)

Answer 13

Question 14

Answer 14

Question 15

Describe the structure of an unbranched polysaccharide.
(2)

Answer 15

Question 16

Describe the formation of glycogen from glucose. (2)

Answer 16

Question 17

Describe how the structure of glycogen is related to its function as a storage molecule.
(2)

Answer 17

Question 18

Explain why high levels of sugars in a person’s diet could lead to obesity.
(3)

Answer 18