What Are the Differences Between Early and Late Endosomes

Multiple Choice

What are the differences between early and late endosomes?

A) Early endosomes exchange their Rab5 proteins for Rab7 proteins as they transform into late endosomes.
B) Late endosomes have a population of vesicles crowding their interior; early endosomes do not.
C) Late endosomes exhibit a lower pH than early endosomes.
D) In late endosomes,the outer boundary membrane has budded inward on its lumenal surface creating a group of vesicles.
E) All of these are correct.