Bacillus megaterium is a prokaryotic cell, lacking membrane-bound organelles. It is a Gram-positive, rod-shaped and found with other bacillus megaterium organisms. It is motile, with the use of its flagella.The cell wall, has large amounts of peptidoglycan.The flow of energy in cellular respiration is considered aerobic, but may undergo anaerobic conditions.ell structure and metabolism. Bacillus megaterium is a prokaryotic cell, lacking membrane-bound organelles. It is a Gram-positive, rod-shaped and found with other bacillus megaterium organisms. It is motile, with the use of its flagella. The cell wall, has large amounts of peptidoglycan.