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IB Biology HL B1.1.9 Formation of Triglycerides and Phospholipids Questions

Practise IB Biology HL B1.1.9 by comparing triglyceride and phospholipid structures, including three versus two fatty acids and the phosphate group.

Syllabus
First assessment 2025
Course
Biology HL
Level
HL

Exam points

  • Explain how condensation links glycerol to three fatty acids through ester bonds in a triglyceride.
  • Identify a phospholipid as glycerol with two fatty acids and an ionized phosphate group.

IB Biology HL B1.1.9 Formation of Triglycerides and Phospholipids Questions question 1

[Maximum number: 2]

A triglyceride is shown.

Displayed triglyceride structure with a three-carbon backbone joined through oxygen-containing links to three long hydrocarbon chains; all tail carbon–carbon bonds are shown as single bonds.

Question (a)

(a)

State the two types of molecules that combine to make a triglyceride.

[ 1 ]

Question (b)

(b)

Annotate the diagram, using an arrow to show where a condensation bond has formed during formation of the triglyceride.

[ 1 ]
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