Presentation on theme: "Unit 6 – Lecture 1. Note: Read and LISTEN!! I mentioned this at the beginning of the year and semester, but as the year progresses, youll have less and."— Presentation transcript:
Unit 6 – Lecture 1
Note: Read and LISTEN!! I mentioned this at the beginning of the year and semester, but as the year progresses, youll have less and less notes given on the screen… in this unit, youll have both information on the screen itself, AND info that youll need to listen for [not everything will be on the board] so Read and LISTEN!!
Recall Classification Organisms are classified by: cell type body type how they attain nutrition genetic composition
Domains There are three domains of Life: Bacteria Archaea Eukarya
Domain: Archaea Kingdom Archaebacteria closer genetically to eukaryotes than eubacteria live in extreme environments high heat, high salt
Discuss Summarize the characteristics of Archaebacteria and check over your notes with a partner to make sure you got everything.
Domain: Eukarya Kingdoms Protista, Fungi, Animalia, Plantae very diverse but all are eukaryotic unicellular or multicellular highly organized sexual or asexual reproduction
Recall – Characteristics of Life It 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) reproduces can pass traits to offspring grows/develops needs energy maintains homeostasis responds to stimuli ?
Viruses Multiple forms: helix icosahedral bacteriophage and more
Viruses Bacteriophage anatomy [aka T-4 bacteriophage or just phage] head = capsid sheath aka tail Nucleic Acid
Viruses Reproduction must occur in a host cell two cycles: lytic cycle lysogenic cycle
Viruses Lytic Cycle attachment infection incorporation of nucleic acid replication: viral DNA uses host to replicate DNA and make more viruses destruction of cell
Viruses Lysogenic Cycle attachment infection incorporation of nucleic acid DNA is dormant & replicates with cell info during cell cycle
Viruses Prion – evil misshapen protein / viral protein responsible for mad cow disease which destroys brain tissue recent discoveries, however, show that normal prions may have an important role in keeping nerve cells healthy
Viruses Uses for viruses vaccines gene therapy Cystic Fibrosis
Recall – Characteristics of Life So…are viruses alive? Why or Why Not? Which characteristics does it share with living things? organized (into cells) reproduces can pass traits to offspring grows/develops needs energy maintains homeostasis responds to stimuli ?
Homework Complete the worksheet on the backside of your lecture notes Draw, Label & Color Bacteria & Viruses