Cells

Cells Cell (biology), basic unit of life. Cells are the smallest structures capable of basic life processes, such as taking in nutrients, expelling waste, and reproducing. All living things are composed of cells. Some microscopic organisms, such as bacteria and protozoa, are unicellular, meaning they consist of a single cell. Plants, animals, and fungi are multicellular; that is, they are composed of a great many cells working in concert. But whether it makes up an entire bacterium or is just one of trillions in a human being, the cell is a marvel of design and efficiency. Cells carry out thousands of biochemical reactions each minute and reproduce new cells that perpetuate life. Cells vary considerably in size . The smallest cell, a type of Cells fall into one of two categories: prokaryotic or eukaryotic (see Prokaryote). In a prokaryotic cell, found only in bacteria and archaebacteria, all the components, including the DNA, mingle freely in the cell’s interior, a single compartment. Eukaryotic cells, which make up plants, animals, fungi, and all other life forms, contain numerous compartments, or organelles, within each cell. The DNA in eukaryotic cells is enclosed in a special organelle called the nucleus, which serves as the cell’s command cells, cell, prokaryotic, proteins, membrane, plasma, dna, called, water, cytoplasm, biochemical, wall, transport, reactions, out, molecules, eukaryotic, composed, cell’s, while, thousands, substances, single, pores, one, nucleus, life, enzymes, environment, bacteria, about, within, whose, whether, two, traffic