Intro to microbio

comparison of ribosomal RNA gene sequences

• bacteria
• archaea
• eukarya

• 1. usually single celled
• 2. most lack a membrane bound nucleus
• 3. ubiquitous
• 4. 70 S Ribosomes
• 5. Between 1-10 micrometers in size
• 6. cyanobacteria produce significant amounts of oxygen

peptiodglycan

• 1. unique rRna gene sequences compared to bacteria
• 2. lack peptidoglycan in cell walls
• 3. have unique membrane lipids
• 4. some have unusual metabolic characteristics
• 5. many live in extreme environments

• 1. single celled or multicellular
• 2. have a true nucleus
• 3. 80S ribosomes
• 4. bigger than bacteria and archaea
• 5. part of food chain
• 6. some are pathogens

fungi

• smallest of all microbes
• virus requires a host cell to replicate
• cause a range of diseases

infectious agent composed of RNA

infectious proteins

hooke and leeuwenhoek

life arises from non living things such as soil or bad air

life arises only from living organisms which may be too small to see

place meat in both uncovered and covered jars and see which ones produced maggots--> only open jars produced maggots