MicrobesChapter 11

What is a microbe?• A microbe is an organism that

can only be seen with the help of a microscope.

• Microbes include:–Viruses–Bacteria–Protists – Fungi

Bacteria• Single-celled• Bacteria are prokaryotes. Their genetic

material is not found in a nucleus.• Size: 1-2 micrometers• Three main shapes: spherical, rodlike, or

spiral.

Bacteria Diagram

•Genetic material•Ribosomes•Cell wall•Cell membrane•Cytoplasm•Flagella

Examples of Bacteria• Cyanobacteria• E. coli• Lyme disease• Pneumonia• Syphilis• Strep throat• Anthrax• Tetanus

Different bacteria invade the body and cause different disease

CholeraDiptheria

Food poisoningLeprosy

Lyme diseases

CholeraVirbrio

http://www.guardian.co.uk/world/video/2009/feb/26/zimbabwe-cholera

http://www.youtube.com/watch?v=3V-UCwxXQ70

Classwork

• Watch brainpop on bacteria• Turn volume off on computer – Closed caption

only, and answer questions. Turn in.

• Homework: Read Section 2 , p. 448 on bacteria. Study the

diagram Take notes on each section