This assignment provides detailed information about electron microscopy and sample preparation. It discusses chemical fixatives classification, including aldehydes (paraformaldehyde and glutaraldehyde), and heavy metal fixatives (osmium tetroxide, uranyl acetate, and lead post stain). The assignment also includes questions about organelles (nucleus, cell membrane, mitochondria, Golgi bodies, cytoplasm, vacuole, rough endoplasmic reticulum, and centriole) as observed in electron microscope images. It provides detailed references to sources used in the preparation of this assignment.