The document describes the main organelles and structures found within plant and animal cells. The cell membrane forms the outer boundary and controls what enters and leaves the cell. Plant cells also contain a cell wall made of cellulose that provides protection and support. The nucleus contains the cell's genetic information and controls most cellular activities. Cytoplasm and organelles like the endoplasmic reticulum, Golgi complex, mitochondria, vacuoles, lysosomes, and in plant cells chloroplasts, carry out specialized functions needed for the cell to survive.