Today’s Topic:•Prokaryotic Cells – Bacteria (e.coli, bubonic plague)•Tomorrow and Friday: Viruses

•Make sure you have your science notebooks out!

PROKARYOTE

EUKARYOTE

Animals, plants, and fungi are eukaryotes

Eukaryotes are organisms whose cells are organized into complex organelles.

Bacteria and prokaryotes

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

Eukariotic Cells are BIGGER!

Prokaryotic Cells are TINY!

Which type of cell is more complex?

Prokaryotes do NOT have a nucleusThey have one strand of DNA that

just floats aroundThey lack MOST organellesProkaryotes are WAY more simple

than eukaryotes

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

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

Found in the intestines of mammals

Many types Most harmless/helpful--produce vitamins

Some cause “food poisoning”

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

Minor diseases: pimples, impetigo, boils, scalded skin syndrome, abscesses

Caused by bacteria, carried by fleas which are carried by rats

Infects the immune systemKey symptoms: buboes (bulges from

swollen lymph nodes), delirium, vomiting, headaches, bleeding lungs

Killed approximately 1/3 of the European population in the 1300-1400s

Traveled and spread quickly

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)