Kingdom EubacteriaKingdom

Archaebacteria

Kingdoms Eubacteria/Archaebacteria Eubacteria contain bacteria cells with

cell walls made of peptidoglycan

Archaebacteria contain bacteria cells with no cell walls.

Bacteria can be found anywhere! Many of them live in places where no other forms of life can survive! (Archaebacteria)

What we already know….

Characteristics: Prokaryotic no membrane-bound

organelles

Single-celled or colonial All of the cells are identical

Heterotrophic or autotrophic

Different types of bacteria… Bacteria cells are

usually one of three different shapes: Rods (bacillus) Spheres (coccus) Spirals (spirillum)

Bacteria

Bacteria can be arranged in several ways:

Single cell2 cells: diploA strand of cells: streptoA cluster of cells: staphylo

Bacteria

When bacteria are found in colonial arrangements, we name them based on their arrangement and their shape.

The first part of the name represents the arrangement. The second part represents the shape.

Examples

EX. Two rod-shaped cells

Diplobacillus

EX. Spherical cells in a linear strand

Streptococcus

Bacteria

Bacterial Cell Structures:

Nucleoid Plasmid Ribosomes Plasma Membrane Cell Wall Flagella Pili

Bacteria

Bacterial DNA is not contained in a nucleus (remember….no membrane-bound organelles!)

Instead, the DNA is tangled up in an area we call the nucleoid.

Bacterial DNA forms loops Known as plasmids

Bacteria

Bacteria cells are classified based on how they react to a certain chemical stain developed by Dr. Gram

Gram-positive. They retain a purple color when

stained with crystal violet.

Bacteria Other bacteria cells have no cell wall and

react differently to the Gram stain

These bacteria are known as Gram negative because they do not stain purple.

How they stain determines what antibiotic is perscribed.

Bacteria Bacteria may achieve motility in

three ways: Using flagella An axial filament (bacteria cell

moves like a corkscrew) Slime

How do bacteria cells reproduce?

Bacteria cells reproduce using binary fission…

Each daughter cell is identical to the parent cell.

Bacterial Conjugationa.k.a Horizontal Gene

Transfer

http://www.learner.org/channel/courses/biology/archive/animations/hires/a_infect1_h.html

Bacterial Conjugation

The connection that is formed between two bacteria cells is known as the conjugation bridge.

The structure that forms the conjugation bridge is called a pili.

The plasmid that gets transferred is known as the F plasmid or the sex plasmid.

Conjugation

Good Bacteria vs. Bad Bacteria There are many bad bacteria in our

environment that can do harm to our bodies.

These bacteria cells are known as pathogenic bacteria

Good Bacteria

Bacteria cells can be easily manipulated and help us produce a variety of products.

For example, we can use bacteria cells to help us produce insulin!

Insulin Production in Bacteria

Insulin Production in Bacteria

Genetic Recombination The gene responsible for insulin production

in humans is removed. The plasmid in the bacteria cell is opened. The human gene is inserted into the

plasmid. The bacteria cell reads the new gene along

with it’s own DNA and becomes an insulin-producing factory!

Insulin is removed from the bacteria cells and given to individuals with diabetes!

Bacteria and Food Production

Bacteria are used in the production of foods such as: Chocolate Sausage Dill Pickles Soy Sauce Olives Dairy Products (Milk,

Cheese, Yogurt)

Bacteria and Vitamins Vitamin B12 is synthesized exclusively

by bacteria through a process called fermentation.

Vitamin B12 is necessary for the synthesis of red blood cells, the maintenance of the nervous system, and growth and development in children.

SAY CHEESE!!

Good Bacteria vs. Bad Bacteria

Bacillus anthracis (causes Anthrax) Commonly occurs in ruminants

Cattle, sheep, goats, etc.

Humans who are exposed to infected animals or a high density of spores (endospore) will become infected.

There are no known cases of people catching anthrax from one another.

Anthrax continued….

Anthrax can infect three different areas: Gastrointestinal

Anthrax (intestine) Pulmonary Anthrax

(lungs) Cutaneous Anthrax

Least fatal; least painful

Escherichia Coli E. Coli live in the lower

intestine of many animals.

However, they can cause several infections when they appear in an area of the body that they are not normally found. Ex. Urinary Tract Infections

Sometimes E. Coli produce a toxin that attacks the body and makes us ill. Ex. Food Poisoning

Streptococcus pharyngitis

These bacteria attack the pharynx.

These bacteria are spread through direct contact(water dropletsfrom sneezing andcoughing)

Antibiotics/Immunity

How Antibiotics Work

Vaccines and Immunity

Immune System