This document discusses the main parts of animal cells including the cell membrane, endoplasmic reticulum, nucleus, ribosomes, Golgi bodies, mitochondria, lysosomes, nuclear membrane, and vacuoles. It notes that plant cells contain chloroplasts and a cell wall that animal cells do not have. The chloroplasts contain gel-like materials and perform photosynthesis while the cell wall protects the plant cell and gives it a rigid boxlike shape.