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Unit 6 – Lecture 1
Note:Read and LISTEN!!
I mentioned this at the beginning of the year and semester , but as the year progresses, you’ll have less and less notes given on the screen…
in this unit, you’ll have both information on the screen itself, AND info that you’ll need to listen for[not everything will be on the board]
so Read and LISTEN!!
Recall ClassificationOrganisms are classified by:
cell typebody typehow they attain nutritiongenetic composition
DomainsThere are three domains of Life:
BacteriaArchaeaEukarya
Domain: BacteriaKingdom Eubacteria
prokaryoticunicellular
Domain: BacteriaKingdom Eubacteria
asexual reproductionsometimes
with conjugationusing pili[sing = pilus]
Domain: BacteriaKingdom Eubacteria
strong cell wallcan be autotroph
or heterotrophsaphrophyteparasitechemoautotrophphotoautotroph
Domain: BacteriaKingdom Eubacteria
found almost everywhere except for extreme environments
some have locomotionflagellacilia
Domain: BacteriaKingdom Eubacteria
three basic body shapes:bacilluscoccusspirillum
strep = chainsstaph = clusters
Discuss
Summarize the characteristics of Eubacteria and check over your notes with a partner to
make sure you got everything.
Domain: ArchaeaKingdom Archaebacteria
prokaryoticunicellularasexual reproduction
sometimes with conjugation
Domain: ArchaeaKingdom Archaebacteria
strong cell wall with unique composition
autotrophicphotoautotrophchemoautotroph
Domain: ArchaeaKingdom Archaebacteria
closer genetically to eukaryotes than eubacteria
live in extreme environmentshigh heat,
high salt
Discuss
Summarize the characteristics of Archaebacteria
and check over your notes with a partner to make sure you got everything.
Domain: EukaryaKingdoms Protista, Fungi, Animalia, Plantae
very diverse but all are eukaryoticunicellular or multicellularhighly organizedsexual or asexual reproduction
Recall – Characteristics of LifeIt is debatable if viruses are truly alive or not. Discuss with a partner whether or not you
think a virus fulfills the characteristics which all living things must have.
organized (into cells)reproducescan pass traits to offspringgrows/developsneeds energymaintains homeostasisresponds to stimuli
?
VirusesMultiple forms:
helixicosahedralbacteriophageand more
VirusesBacteriophage anatomy
[aka T-4 bacteriophage or just “phage”]
head = capsidsheath aka tail
Nucleic Acid
VirusesReproduction
must occur in a host cell two cycles:
lytic cyclelysogenic cycle
VirusesLytic Cycle
attachmentinfectionincorporation of
nucleic acidreplication:
viral DNA uses host to replicate DNA and make more viruses
destruction of cell
VirusesLysogenic Cycle
attachmentinfectionincorporation of
nucleic acidDNA is dormant &
replicates with cell info during cell cycle
VirusesPrion – “evil misshapen protein” / viral
proteinresponsible for mad cow disease which
destroys brain tissuerecent discoveries, however, show that
“normal” prions may have an important role in keeping nerve cells healthy
VirusesUses for viruses
vaccinesgene therapy
Cystic Fibrosis
Recall – Characteristics of LifeSo…are viruses alive? Why or Why Not?
Which characteristics does it share with living things?
organized (into cells)reproducescan pass traits to offspringgrows/developsneeds energymaintains homeostasisresponds to stimuli
?
HomeworkComplete the worksheet on the backside of
your lecture notes Draw, Label & Color Bacteria & Viruses