Bacteria and Viruses

Chapter 19

Classification

Kingdom…Moneran Domaina) Euchaeab) Bacteria

Classification Characteristics

What characteristics do you know so far????

Characteristics

Prokaryote Found anywhere

Classification

Round coccus Rod bacillus Corkscrew spirillum

Pathogenic Bacteria

What is a pathogen? Only 20% bacteria cause disease

Strep Throat

MRSA

Staph Infection

STD Syphilis

Tetnus

80% of bacteria are friendly

Intestinal (mutualism)

Decomposers

Nitrogen Fixing Bacteria

Bacterial Structure

Bacteria Have Only 1 Chromosome

How Do We Slow Down Bacteria From Spoiling In Our Foods??????

What Is Meant By The Term “sterilization”??

Why Do We Get A Fever When We Have An Infection?

How Do Scientists Use Bacteria For Society?????

Genetic Engineering Cleaning up oil spills Mine minerals from the ground Food production Making of chemicals Making medicines

What Do You Know About Viruses?

Do You Know????

What is the basic unit of all life?

Main parts of the cell?

Cell membrane Nucleus DNA Cytoplasm

Did You Know?????

A virus is many times smaller than one bacterial cell

BUT…………….

A virus is not a cell

Did You Know???

Viruses come in a variety of shapes

Viral Shapes

HIV Virus

Measles

Small Pox

West Nile

Viruses can also attack

Bacteriophage

Virus That Attacks Tobacco

Remember the movie “OUTBREAK”?

Basic Structure of a Virus

Basic Viral Structure

A protein coat A DNA or RNA core Structures that are used to attach

to the host cell There is no cell membrane nor

cytoplasm

A virus must invade a host cell to replicate

HIV coming out of a white blood cell

I call this virus “the sleeper”

When cell divides, the viral gene also is replicated

Retrovirus

A virus that contains RNA instead of DNA

Can cause some human and animal cancers

Also is the cause of AIDS

What About Our Pets???

Dog/Cat Distemper Virus Dog/cat West Nile Virus Dog/Cat Avian Flu

Can Viruses Attack Plants ??

Yes

How Can A Viral Infection Be Prevented??

Vaccines Vaccines were given to the birds at

the Zoo to prevent West Nile and Avian Virus

What is in a vaccine?

Weaken or dead parts of a virus The immune system does not

know any better and will build the antibodies to fight the virus

Two Ways We Can Become Immune To a Viral Infection

Active Immunity contracting the disease Passive Immunity vaccines breast milk