PLANT AND ANIMAL CELLS 2.1 Biology is a science. It is based on the cell theory. The cell theory states that All living things are made up of cells. The cell is the simplest unit that can carry out all life processes. All cells are reproduced from other cells. cell theory Bacteria reproduce by dividing in two.

PROKARYOTES AND EUKARYOTES 2.1 All living things are made up of cells. Cells can be very simple or very complex. The simplest life forms are called prokaryotes. These single-celled life forms have no nucleus. A bacterium is an example of a prokaryote. More complex organisms are called eukaryotes. Eukaryotes may be single-celled or multi-celled organisms with a nucleus. Plants and animals are examples of eukaryotes. Eukaryote cells are much larger than prokaryote cells, often tens to thousands of times larger. prokaryotes eukaryotes

FUNCTION AND STRUCTURE OF CELLS 2.1 All cells have to perform certain basic activities to stay alive. These activities are performed by organelles, with each organelle having a specific function within the cell. Organelles work together to meet the life needs of the cell. Plant and animal cells have many structures in common. However, plant cells have some organelles that animal cells do not.