The bulk of the energy required by the eukaryotic cell is generated by the mitochondria. the mitochondrion consists of cristae that form a smooth, continuous outer membrane surrounding the entire organelle. form a complex fluid called a matrix outside the organelle. are elaborate folds of the inner membrane which hold the enzymes and electron carriers of aerobic respiration. are circular strands of dna involved in producing the enzymes needed for anaerobic respiration.