MATSEC AM Biology Practice Questions - Malta Advanced Matriculation (AM) Biology - AM 05 (2026) Exam

Endosymbiotic theory is best supported by which observation about mitochondria and chloroplasts?

They lack their own DNA and divide only when the nucleus divides by mitosis They synthesise all eukaryotic proteins on 80S cytosolic ribosomes only They have circular DNA, 70S ribosomes and double membranes consistent with free-living bacterial ancestors They are found exclusively in prokaryotic cells

Correct Answer:

They have circular DNA, 70S ribosomes and double membranes consistent with free-living bacterial ancestors

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