E.coli on small intestines                                                                            1                                                                            1                                                                            1                                                                            1                                                                            1 Helpful Bacteria http://www.denniskunkel.com/PublicHtml/Edu-SearchResults.asp?Category=&ImageNumber=&Keyword3=&Keyword2=&Keyword1=bacteria&offset=60 E.coli on small intestines

Introduction to Bacteria 2 TYPES OF BACTERIA: Bacteria -Get food from an outside source Blue-green Bacteria -Make their own food http://www.specialedprep.net/MSAT%20SCIENCE/KingdomMonera.htm http://fig.cox.miami.edu/Faculty/Dana/monera.html

Bacteria are classified by shape into 3 groups: 3 Shapes of Bacteria Bacteria are classified by shape into 3 groups: Spiral: spirilla rod-shaped: bacilli, bacillus Round: cocci http://www.east-buc.k12.ia.us/Ins/00-01/HS/le1.GIF

Bacillus anthracis – (bacillus) 3 Shapes of Bacteria Neisseria meningitidis (coccus) http://www.east-buc.k12.ia.us/Ins/00-01/HS/le1.GIF Leptospira interrogans – (spirilla)

7 Major Structures of a Bacteria Cell Capsule Cell wall Ribosomes Nucleoid Flagella Pilli Cytoplasm http://www.east-buc.k12.ia.us/Ins/00-01/HS/le1.GIF

7 Major Structures of a Bacteria Cell Capsule keeps the cell from drying out and helps it stick to food or other cells

7 Major Structures of a Bacteria Cell Cell wall Thick outer covering that maintains the overall shape of the bacterial cell

7 Major Structures of a Bacteria Cell Ribosomes cell part where proteins are made Ribosomes give the cytoplasm of bacteria a granular appearance in electron micrographs

7 Major Structures of a Bacteria Cell Nucleoid a ring made up of DNA

7 Major Structures of a Bacteria Cell Flagella a whip-like tail that some bacteria have for locomotion

7 Major Structures of a Bacteria Cell Amimation of E.coli

Pilli 7 Major Structures of a Bacteria Cell hollow hair-like structures made of protein allows bacteria to attach to other cells. Pilli-singular Pillus-plural

7 Major Structures of a Bacteria Cell Cytoplasm clear jelly-like material that makes up most of the cell

Reproduction of Bacteria Binary Fission- the process of one organism dividing into two organisms Fission is a type of asexual reproduction Asexual reproduction- reproduction of a living thing from only one parent How?... The one main (circular) chromosome makes a copy of itself Then it divides into two www-raider.stjohns.k12.fl.us/.../ sv16.html

BINARY FISSION Bacteria dividing Completed Reproduction of Bacteria http://www.cellsalive.com/ecoli.htm http://www.cellsalive.com/cam2.htm Bacteria dividing Completed

Reproduction of Bacteria The time of reproduction depends on how desirable the conditions are Bacteria can rapidly reproduce themselves in warm, dark, and moist conditions Some can reproduce every 20 minutes (one bacteria could be an ancestor to one million bacteria in six hours) http://www.east-buc.k12.ia.us/Ins/00-01/HS/le1.GIF

Binary Fission Bacterial Cell & Nucleiod DNA Ring DNA replication Cell wall synthesis http://www.brooklyn.cuny.edu/bc/ahp/MBG/MBG3/CB.Binaryfission.GIF Cell separation

Bacteria Survival Endospore- a thick celled structure that forms inside the cell they are the major cause of food poisoning allows the bacteria to survive for many years they can withstand boiling, freezing, and extremely dry conditions it encloses all the nuclear materials and some cytoplasm

Endospore-the black section in the middle Bacteria Survival Bacillus subtilis Endospore-the black section in the middle highly resistant structures can withstand radiation, UV light, and boiling at 120oC for 15 minutes.

Bacteria Survival – Food sources parasites – bacteria that feed on living things saprophytes – use dead materials for food (exclusively) decomposers – get food from breaking down dead matter into simple chemicals important- because they send minerals and other materials back into the soil so other organisms can use them http://fig.cox.miami.edu/Faculty/Dana/monera.html

Ecoli movement animatoin                                                                            1                                                                            1                                                                            1                                                                            1                                                                            1 Strep animation http://www.hybridmedicalanimation.com/pages/jjani_qt/strep_pneumo_qt.html Ecoli movement animatoin http://www.hybridmedicalanimation.com/pages/jjani_qt/ecoli_qt.html

Ecoli movement animatoin http://www.hybridmedicalanimation.com/pages/jjani_qt/ecoli_qt.html

                                                                           1                                                                            1                                                                            1                                                                            1                                                                            1 HIV movie http://www-micro.msb.le.ac.uk/Video/HIV.mov