The cell is the basic unit of all living things.There are two types of cell - prokaryotic (bacterial cells) and eukaryotic (plant, animals, fungi and protoctists).All cells contain a fluid medium called cytoplasm enclosed in a phospholipid plasma membrane. A nucleus or genetic material and organelles are suspended in the cytoplasm.All metabolic reactions (chemical reactions) take place in the cytoplasm. Most reactions are catalysed by enzymes.