See what the cell is, in structural perspective.

What are Cells? Cells are what make up all living things. They are the building blocks of life. Plant and animal are built up of cells that are stuck together. Structure of Animal and Plant Cells It is important that you know the structure of animal and plant cells and are able to label the different parts. It is a favourite with examiners to have diagrams of cells requiring labelling in exams There are many similarities and differences between animal and plant cells. Make sure you know these. Similarities Differences 1. Have a nucleus 1. Plant cells have a cellulose cell wall 2. Have a cytoplasm 2. Plant cells have a vacuole containing cell sap 3. Have a cell membrane 3. Plant cells have chloroplast 4. Contain mitochondria 4. Many plant cells have a box-like shape whilst animal cell shape varies 5. Contain ribosomes 5. Plant cells have the nucleus to the side of the cell, animal cells have a nucleus in the middle INTRODUCTION TO CELL STRUCTURE The purpose of this guide is to provide an overview of the basic structural components of living cells. In reviewing these structures, we will also discuss their functions. All living organisms are composed of cells. A cell is a small, membrane-bound compartment that contains all the chemicals and molecules that help support an organism's life. An understanding of the structure of cells is one of the first steps in comprehending the complex cellular interactions that direct and produce life. Cells can be thought of as building blocks of organisms. Some organisms are composed of a single cell. Others, like ourselves, are composed of millions of cells that work together to perform the more complex functions that make us different from bacteria. It is difficult to imagine that humans are descendants of a single cell, but this is a common belief in the scientific world. Before we can understand how multiple cells can work together to create complex biological functions, it is necessary to understand what biological functions single cells are capable of performing on their own to sustain life. There are different types of cells with individuated structures. Single-celled organisms have different cell structure than multi-celled organisms and plant cells have different structures from animal cells. These differences reflect differences in the functions that each of these classes of cells is required to perform. While the focus of this guide will be on the structures that compose complex multi-cellular organisms, we will begin our discussion of cell structure with a structure that is universal to all cells, membranes.