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Edexcel IAL Biology 1.2 Monosaccharides, disaccharides and polysaccharides

Name the monomers and glycosidic links, distinguish branching patterns and connect compactness, insolubility or accessible chain ends to the stated role.

Syllabus
First assessment 2019
Course
Biology YBI11
Level
AS

Exam points

  • Classify named carbohydrates correctly as mono-, di- or polysaccharides in tables.
  • Describe glycogen, amylose or amylopectin through glucose units, bonds and branching.
  • Interpret carbohydrate graphs by comparing temperature, time or biological source.

1.2—Monosaccharides, disaccharides and polysaccharides question 1

[Maximum number: 9]

The structures of polysaccharides, disaccharides and monosaccharides relate to their roles in living organisms. They are all types of carbohydrate.

Question (a)

(a)

The table shows the main type of carbohydrate present in some foods.

Table for Question (a) — Edexcel A-Level Biology AS
[ 3 ]

Question (i)

(i)

Which row of the table shows an example of a polysaccharide, a disaccharide and a monosaccharide? □ A □ B □ C □ D

Table for Question (i) — Edexcel A-Level Biology AS
[ 1 ]

Question (ii)

(ii)

Glycogen is another carbohydrate.

Describe the structure of glycogen.

[ 2 ]

Question (b)

(b)

*(c) Carbohydrate metabolism includes the group of chemical reactions that break down carbohydrates. Some of these reactions convert one type of carbohydrate into another type. The flowchart shows what happens to some of the carbohydrates that we eat.

Figure for Question (b) — Edexcel A-Level Biology AS

Explain how carbohydrates are metabolised, transported and used in the cells of the body and stored in liver cells. Use the information in the question and your own knowledge of the structures, roles and properties of carbohydrates and transport mechanisms.

[ 6 ]
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