Discuss the evidence supporting the endosymbiotic theory for the origin of eukaryotes.

a. chloroplasts, mitochondria and prokaryotes are a similar size;

b. all have 70S ribosomes;

c. double membrane suggests engulfing by endocytosis;

d. all contain naked DNA;

e. all divide by binary fission;

f. chloroplasts and mitochondria cannot survive on their own;

g. theory cannot be repeated/falsified;

This question discriminated well with most candidates scoring some marks and the stronger candidates achieving full marks.