IB Biology HL · Unit 2 of 6

IB Biology HL Unit 2: Form and function

Unit 2 of IB Biology covers Form and function. This unit contains 10 topics and 52 sub-topics. Below you'll find free study notes, flashcards, and exam preparation resources for every topic in this unit.

Higher Level students should treat this unit page as a route map: revise the shared core, then use the HL notes and topic links to reach the extra depth and evaluation expected at HL.

10 topics52 sub-topics

Exam technique guide

Topics in Unit 2

2.1

Carbohydrates and lipids

6 sub-topics

2.2

Proteins

5 sub-topics

2.3

Membranes and membrane transport

5 sub-topics

2.4

Organelles and compartmentalization

4 sub-topics

2.5

Cell specialization

6 sub-topics

2.6

Gas exchange

6 sub-topics

2.7

Transport

5 sub-topics

2.8

Muscle and motility

5 sub-topics

2.9

Adaptation to environment

5 sub-topics

2.10

Ecological niches

5 sub-topics

Study tip: Work through the topics in order — each builds on concepts from the one before. Start with notes, then reinforce with flashcards and practice questions.

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Unit 1 Unit 3