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Introduction to Wikis
1 The Science of Biology
2 Organic Chemistry and Water
7 Cell Structure and Function
10 Cell Growth and Division
11 Introduction to Genetics
12 DNA and RNA
13 Genetic Engineering
13 Genetic Engineering Part 2
14 The Human Genome
Chapter 19 Bacteria
Robert Hooke and Anton Van Leeuwenhoek Made The First Microscope, We Can Now View Microscopic Viruses and Bacterias.
Prokaryotes- Single Celled Organisims That Lack A Nucleus.
Prokaryotes Range From 1 To 5 Micrometers.
Bacteria reproduces through a process called binary fission which is a type of asexual reproduction that prokaryotes go through.
They were simply called Bacteria In the kingdom Monera for years. Now they are separated into two different kingdoms Archaebactetria and Eubacteria.
The Larger Of The Two Kindoms of Prokaryotes.
The Cell Wall Of The Eubacteria is Called Peptidoglycan, Which Carbohydrate.
Some Eubacteria Have Have Second, Outer, Membrane.
Archaebacteria and Eubacteria look The Same Under A Microscope. They Are Equally Small, Lack Nuclei, And Have Cell
Archaebacteria lack peptidoglycan, a Carbohydrate Found In the Cell Walls Of Eubacteria, And Their Membrane lipids are Quite Different. Also, The DNA Sequences Of Key Archaebacterial Genes Are More Like those Of Eukaryotes Than Those Of Eubacteria
The flagellum is what helps the bacteria move around
The pili allows the bacteria to attach to other cells
The plasma membrane moves ions,nutrients, and waste across the membrane.
binary fusion is a form of asexual reproduction occurring in all prokaryotes. The result is two cells that are identical to the one they came from that has the potential to grow to the size of the original cell.
Prokaryotes are identified by their:
1. Rhod-shaped: Bacilli
Bacterial disease and resistance:
Penicillin discovered in 1928 by Alexander Fleming was the start of the worlds ability to combat disease caused by bacteria it was also when bacteria started to become drug resistant. After Howard Florey and Ernst Chain truly brought the benefits of penicillin to the public in 1929 bacterial infection as a cause of death plummeted in fact life expectancy rose 8 years between 1944 and 1972. With this came a price, the bacteria adapted, if bacteria was exposed to a certain dose of penicillin it would die but if it was less than that dose then the bacteria lives, gains an immunity of sorts and passes that on during binary fusion. Eventually with so many people using penicillin and other antibiotics the resistant bacteria spread across the world rendering the drugs much less effective.
2. Spherical: Cocci
3. Spiral and corkscrew-shaped: Spirilla
File:Bacterial infections and involved species.png
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