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CAIE A-Level Biology 2.2.8 Phospholipid Structure

Practise identifying a phospholipid’s polar phosphate head and two non-polar fatty-acid tails, then explaining amphipathic behaviour and bilayer orientation.

Syllabus
2028–2030
Course
Biology 9700
Level
AS

Exam points

  • identify the polar hydrophilic phosphate head and two non-polar hydrophobic tails
  • distinguish phospholipids from triglycerides by phosphate and fatty-acid number
  • explain bilayer orientation from head interactions with water and inward-facing tails

2.2.8—Phospholipids question 1

[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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