3.6 prokaryotic cells and viruses

• eukaryotic cells are larger and have a nucleus bounded by nuclear membranes
• prokaryotic cells are smaller and have no nucleus or nuclear envelope
• all bacteria possess a cell wall made up of murein
• many bacteria secrete a capsule of slime for protection
• bacteria store food as glycogen granules and oil droplets
• the genetic material in bacteria is in the form of a circular strand of DNA and smaller circles of DNA called plasmids
• some species of bacteria have a flagellum for locomotion
• viruses contain nucleic acids such as DNA or RNA as genetic material
• viruses can only multiply inside a living host
• the nucleic acid in a virus is enclosed within a protein coat called the capsid
• some viruses' nucleic acid is further surrounded by a lipid envelope
• in a virus, if the lipid envelope isn't present, the capsid has attachment proteins