Transcript Chapter 17 - Damien Rutkoski

Chapter 17
By:Cody Crawford
Ch17-2 Finding Order In Diverse
FJ
• Classification system identifies object and
gathers them into groups whose members
are similar to one another
Taxonomy
• The science of naming organisms
• Current system was established by Linnaeus
in the 18th century
• Two names (genus & species) * AKA
Binomial Nomenclature EX) house cat, felis
domesticus
Classification Groups
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Kingdom
Phylum
Class
Order
Family
Genus
Species
Ch17-3 Bacteria- The First
Organisms
• All bacteria are prokaryotes
• Have a cell membrane that is surrounded by
a cell wall
• Their genetic material is contained on a
single strand or circular DNA that is not
surrounded by a nuclear envelope
• Lack organelles & a nucleus
Eubacteric
• “true bacteria”
• Thick rigid cell wall made up of the
carbohydrate peptidoglycan
• Some live in soil where others can live in
your gut
Archaebacteric
• “ancient bacteria”
• Live in the most extreme conditions EX)
hot springs & salty lakes
• Their cell walls lack peptidoglycan
How Do Bacteria Reproduce
• Simple reproduction (asexual)
• Binary fission- division of a cell into two daughter
cells
• Most bacteria reproduce by this means
• Conjugation- simple form of sexual reproduction
ex. e. coli
• Transformation- is the ability to pick up bits and
pieces of DNA from other bacteria EX)
streptococcus pneumoniae