The archaebacteria ☆ Sulfur硫 bacteria 令 Methanogens( methane甲烷) They grow in unusual environments: salt brines, hot acid springs, in the ocean depths
The archaebacteria ❖ Sulfur硫 bacteria ❖ Methanogens（methane-甲烷） They grow in unusual environments: salt brines,hot acid springs,in the ocean depths
Cell structure Each'prokaryotic cell is surrounded by a plasma membrane 质膜 The cell has no subcellularorganelles, only infoldings of the plasma membrane called mesosomes中间体 The deoxyribonucleic aid (DNA)is condensed within the cytosol to form the nucleoid拟核 Some prokaryotes have tall-like flagella鞭毛
Cell structure • Each prokaryotic cell is surrounded by a plasma membrane 质膜. • The cell has no subcellular organelles,only infoldings of the plasma membrane called mesosomes中间体. • The deoxyribonucleic aid (DNA) is condensed within the cytosol to form the nucleoid拟核. • Some prokaryotes have tall-like flagella鞭毛
Cell structure Prokaryotic cell Structure eyt。 past Nucleoid capsul Cell wall yt。 plasmic Membrane es Flagella igure
Cell structure
Bacterial cell walls The peptidoglycan (protein and oligosacca-ride)cell wall protects the prokaryotic cell from mechanical and osmotic pressure. A Gram-positive bacterium has a thick cell wall surrounding the plasma membrane, whereas Gram negative bacteria have a thinner cell wall and outer membrane, between which is the periplasmic space
Bacterial cell walls • The peptidoglycan (protein and oligosacca-ride) cell wall protects the prokaryotic cell from mechanical and osmotic pressure. • A Gram-positive bacterium has a thick cell wall surrounding the plasma membrane,whereas Gramnegative bacteria have a thinner cell wall and outer membrane,between which is the periplasmic space