10-19-11 Wednesday Today’s Topic: Prokaryotic Cells – Bacteria (e.coli, bubonic plague) Tomorrow and Friday: Viruses Make sure you have your science notebooks out!

There are 2 types of cells EUKARYOTE PROKARYOTE

Eukaryotic Cells Animals, plants, and fungi are eukaryotes Eukaryotes are organisms whose cells are organized into complex organelles.

Prokaryotic Cells Bacteria and prokaryotes Prokaryotes are unicellular (one celled) organisms that lack a nucleus and most organelles.

Huge Size Difference! Eukariotic Cells are BIGGER! Prokaryotic Cells are TINY! Eukariotic Cells are BIGGER!

Actual Prokaryotic Cells

Which organelles is the Prokaryote cell missing?

Artist’s illustration of a Prokaryote and Eukaryote Cell Which type of cell is more complex? Artist’s illustration of a Prokaryote and Eukaryote Cell

Major Takeaways Prokaryotes do NOT have a nucleus They have one strand of DNA that just floats around They lack MOST organelles Prokaryotes are WAY more simple than eukaryotes

What Is Bacteria? Bacteria are tiny, one-cell creatures that get nutrients from their environments in order to live.

Are All Bacteria Bad? No, some are very helpful (Ex: There are bacteria in your stomach that help break food down) Only some bacteria are harmful - Bacterial infections can be treated with antibiotics

E. coli Found in the intestines of mammals Many types Most harmless/helpful--produce vitamins Some cause “food poisoning”

Staph infection Scientific name: Staphylococcus aureus 20-30% of the population carry staph on their skin Only becomes a problem when it gets into a cut or out of control

Diseases caused by Staph infections: Minor diseases: pimples, impetigo, boils, scalded skin syndrome, abscesses

Bubonic Plague: “Black Death” Caused by bacteria, carried by fleas which are carried by rats Infects the immune system Key symptoms: buboes (bulges from swollen lymph nodes), delirium, vomiting, headaches, bleeding lungs

A bacterium, carried by fleas which are carried by rats

Black death epidemic Killed approximately 1/3 of the European population in the 1300-1400s Traveled and spread quickly

Ring Around The Rosie Ring around the Rosie Pocket full of posy Ashes, Ashes We all fall down (Ring around the rosie, what do you suppose we can do to fight the darkness in which we drown. Ring around the rosie, this evil thing it knows me, lost ghosts surround me, I can't fall down)

Plague still exists, but is easily identifiable and can be cured with antibiotics.

Other Life-threatening diseases Caused By Bacteria: pneumonia, meningitis

“Flesh Eating Disease”