For 10 points, name these organelles which take in extracellular molecules by fusing with endosomes.
Belgian biochemist Christian de Duve identified them in 1955 with the aid of an electron microscope.  Originating as buds on the trans-Golgi network, they have an acidic interior which can destroy other worn out organelles and cellular invaders.  For 10 points, name these organelles which take in extracellular molecules by fusing with endosomes.
Belgian biochemist Christian de Duve identified them in 1955 with the aid of an electron microscope.  
lysosomes