1. Prokaryotes and eukaryotes EukaryotesProkaryotesCharacteristic Typically 10-100 m m in diameter Typically 0.2-2.0 m m in diameter Size of cell True nucleus, consisting of nuclear membrane & nucleoli No nuclear membrane or nucleoli (nucleoid) Nucleus Present; examples include lysosomes, Golgi complex, endoplasmic reticulum, mitochondria & chloroplasts Absent Membrane-enclosed organelles Complex; consist of multiple microtubules Consist of two protein building blocks Flagella

2. Prokaryotes and eukaryotes ProkaryotesEukaryotesCharacteristic When present, chemically simple Usually present; chemically complex (typical bacterial cell wall includes peptidoglycan) Cell wall Sterols and carbohydrates that serve as receptors present No carbohydrates and generally lacks sterols Plasma membrane Cytoskeleton; cytoplasmic streaming No cytoskeleton or cytoplasmic streaming Cytoplasm Larger size (80S); smaller size (70S) in organelles Smaller size (70S)Ribosomes Multiple linear chromosomes with histones Single circular chromosome; lacks histones Chromosome (DNA) MitosisBinary fissionCell division

3. Prokaryotic cells

4. Eukaryotic cells