Cells are the basic units of life. The largest known animal is the blue whale. Prokaryotes are cells that have a nucleus. All cells have a cell membrane. All cells have a cell wall.
Ribosomes are the sites of protein synthesis in cells.
Storage areas within a cell are know as lysosomes. Chromosomal DNA is duplicated and divided into two identical sets during mitosis. Mitosis occurs only in gametes. Cellular respiration releases chemical energy for cellular use. The nucleus is the structure inside a cell that directs cell activities.