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IB Biology HL A2.2.12 Hl Endosymbiosis Origin of Eukaryotes Questions

Practise IB Biology HL A2.2.12 by evaluating DNA, ribosome, membrane and replication evidence for the endosymbiotic origin of mitochondria and chloroplasts.

Syllabus
First assessment 2025
Course
IB Biology
Level
HL

Exam points

  • Explain how engulfed prokaryotes could have become mitochondria or chloroplasts in eukaryotic cells.
  • Use circular naked DNA, 70S ribosomes, double membranes, binary fission and related size as evidence for endosymbiosis.
  • Compare organelle and prokaryote features to evaluate the endosymbiotic theory, including bacterial lineage evidence where assessed.

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Study A2.2.12 (HL)—Endosymbiosis origin of eukaryotes conceptsOpen the corresponding Concept lesson for explanations, examples and exam connections.

IB Biology HL A2.2.12 Hl Endosymbiosis Origin of Eukaryotes Questions question 1

[Maximum number: 4]

Cell biologists play an important role in research into disease, fertility, evolution and many other areas of science.

Describe the origin of eukaryotic cells according to the endosymbiotic theory.

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