The genetic material, i.e., presence of DNA is common between the two cells.The presence of RNA is common.They both have a cell membrane covering them.Resemblances are seen in their basic chemical structures. Both are made up of carbohydrates, proteins, nucleic acid, minerals, fats, and vitamins.Both of them have ribosomes, which make proteins.They regulate the flow of nutrients and waste matter that enters and exits the cellules.Basic life processes like photosynthesis and reproduction are carried out by them.They need energy supply to survive.They both have 'chemical noses' that keep them updated and aware of all the reactions that occur within them and in the surrounding environment.Both these organisms have a fluid-like matrix called the cytoplasm that fills the cells.Both have a cytoskeleton within the cell to support them.They have a thin extension of the plasma membrane which is supported by the cytoskeleton.Flagella and cilia are found in eukaryotes; likewise endoflagella, fimbriae, pili and flagella are found in prokaryotes. They are used for motility and adhering to surfaces or moving matter outside the cells.Some prokaryotic and eukaryotic cellules have glycocalyces as a common material. This is a sugar-based structure that is sticky and helps the cells in anchoring to each other; thus, giving them some protection.They have a lipid bilayer, known as the plasma layer, that forms the boundary between the inner and outer side of the cell.There are many differences between them, of which aRead more at Buzzle: http://www.buzzle.com/articles/similarities-between-prokaryotic-and-eukaryotic-cells.htmlCharacteristicsVirusViroidPrion

Nucleic AcidssDNA,dsDNA,ssRNA, dsRNAssRNAno

Presence of capsid or envelopyesnono

presence of protienyesnoyes

Need for helper virusesyes/no(needed by some of the smaller viruses)(blank)(blank)

Viewed byElectron microscopyNucleotide sequence identificationhost cell damage

Affected by heat & protein denaturing agentsyesnono

Affected by radiation of enzymes that digest DNA or RNAyesyesno

Hostbacteria, animals, plantsplantsmammals