Parabasalids Are a Small Group of Protists Involved in Parasitic

Parabasalids are a small group of protists involved in parasitic or commensal relationships with animals. Parabasalids are unusual in that

A) they lack mitochondria.
B) they have plasmids contain cytochromea.
C) their mitochondria lack DNA and carry out anaerobic respiration.
D) they have a single mitochondrion, containing a large rod-shaped mass of DNA, at the base of the flagella.
E) their mitochondria are surrounded by three membranes, suggesting that the ancestors of Parabasalids gained their mitochondria by secondary endosymbiosis.

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