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CAIE A-Level Biology 2.2 Carbohydrates and Lipids Question Bank

Practise carbohydrate-and-lipid questions by drawing glucose rings, naming bonds and linking polysaccharide, triglyceride or phospholipid structure to function.

Syllabus
2028–2030
Course
Biology 9700
Level
AS

Exam points

  • draw α-glucose or β-glucose rings and classify mono-, di- and polysaccharides
  • explain condensation or hydrolysis of glycosidic and ester bonds with water use or release
  • compare starch, glycogen, cellulose, triglycerides and phospholipids by structure and role

Covered syllabus points

2.2.1—α-glucose and β-glucose rings2.2.2—Biological molecule terminology2.2.3—Role of covalent bonds in forming polymers2.2.4—Reducing and non-reducing sugars2.2.5—Glycosidic bonds2.2.6—Molecular structure of polysaccharides2.2.7—Triglycerides2.2.8—Phospholipids

2.2 Carbohydrates and Lipids question 1

[Maximum number: 1]

What is a feature of triglyceride molecules?

A

They are hydrophobic molecules.

B

They are molecules with a single ester bond.

C

They are polar molecules.

D

They are water-soluble molecules.

2.2 Carbohydrates and Lipids question 2

[Maximum number: 1]

Fig. 1.1 is a diagram representing part of the phospholipid bilayer of a cell surface membrane.

Fig. 1.1

Fig. 1.1

Identify the part of a phospholipid molecule, labelled A in Fig. 1.1, that forms bonds with the phosphate heads and with the fatty acid tails.

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