Wednesday, 3/18/2015○ (4th period - 2 DNA videos)○ Finish the Microscope Lab

○45 minutes○Including Part E

○ Prokaryotic/Eukaryotic Review PowerPoint○ Pick up Prokaryotic/Eukaryotic Worksheet

on front table○ RETURN UNIT 5 TEST○ HW: Bellringer 6.1

& Prokaryotic/Eukaryotic worksheet

Prokaryotic

Genomes

Prokaryotes

The Who’s Who of Infectious Bacteria

E. coliSalmonella

Chlamydia

Streptococcus

Meningitis

Gonorrhea

Bacteria Get a Bad Rap○ Life would be impossible without

bacteria○ Decomposition○ Fixing of nitrogen○ Intestinal symbionts

Crazy facts!○ 10x as many bacterial cells in you as

human cells (100 trillion)

○ 4 pounds of bacteria in you right now

○ More bacteria in your mouth than people in the world (every kiss exchanges 10 million to 1 billion bacteria)

http://www.factslides.com/s-Bacteria

Remember Unit 4?

Genomic Differences○Our DNA and thus our

heredity is much different from bacteria!

○We taught you heredity for eukaryotes (humans specifically)

1. Circular Chromosome○ Still a DNA double helix

2. # of chromosomes○Eukaryotes

have many (the # depends on the species)○Humans – 46

○Prokaryotes have 1

3. No pairs of chromosomes○ Since they only have 1, bacteria do not

have 2 copies of every gene like we do○ They also do not reproduce sexually

4. No histone wrapping○ Much simpler chromosomal structure○ Different mechanism for controlling

gene expression

5. Much less DNA

○Millions, not billions of nucleotides

○About 10% as many genes as us

○Much, much less non-coding DNA

6. Not found in a nucleus

Summary

○Prokaryotes are much more simple than eukaryotes!

○Classwork/HW sheet○Bellringer next class