This document introduces key vocabulary terms related to cells, using analogies to turtles to help explain the terms. It notes that cells are the basic unit of life and there are two main classes of cells: plant cells and animal cells. Each cell type has a specific job or function. Key cellular structures are then defined, such as the cell membrane, cytoplasm, mitochondria, nucleus, chromosomes, and others. The main difference between plant and animal cells is noted to be the presence of chloroplasts and a cell wall only in plant cells.