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The endosymbiotic theoryA.Proposes a model for the origin of life.B.Explains the origin of eukaryotic cells.C.Describes the need for the eukaryoticnucleus.D.Shows the need for the endoplasmicreticulum.
The endosymbiotic theoryA.Proposes a model for the origin of life.B.Explains the origin of eukaryotic cells.C.Describes the need for the eukaryoticnucleus.D.Shows the need for the endoplasmicreticulum.
CytoskeletonProvides shape and support for the cellIs composed of microtubules (thickest), intermediatefilaments, and microfilaments (thinnest)Microtubules and microfilaments are seen todisassemble and reassembleIntermediate filaments tend to be more permanentComprised of a variety of materials, including keratinMicrofilaments (actin)- also easily assembled anddisassembledListeria monocytogenes-a bacterial pathogen which joyrideson actin filamentsListeriaactin rocket:
CytoskeletonFigure 3.20
Actin and tubulin images
MicrotubulesMicrotubules are alsoresponsible for thestructure andmovement ofciliaandflagellaCilia are numerous shortextensions in a cell thatmove back and forthFlagella are larger thancilia and move in anundulating manner
Eukaryotic cilia and flagella are madeof bundles of microtubules9 + 2 arrangement
How are prokaryotic and eukaryoticflagella related?Prokaryotic and eukaryotic flagella are similar infunction, but with different, independent evolutionaryhistories- they areanalogousstructuresAre these aquatic body formshomologous or analogous?
Evolution puts life’s unity, and itsdiversity, in contextWhy do the cilia on a unicellular Paramecium lookidentical in the microscope to cilia on the humanwindpipe?
Motor proteins and microtubulesmaking flagella wiggleWhat energy source powers thisprocess?
Cell junctions join cells together, form a barrier, andallow cells to communicate with their neighbors
Learning ObjectivesUnderstand that there are different subrealmsof the microscopic, and different ways to viewthem.Explain why the phylogenetic tree of lifecontains two major groups of prokaryotes.Explain why cell structure is studied.Identify the functions of prokaryotic cellstructures.Identify the functions of eukaryotic cellstructures.
Which of the following is found in botheukaryotic and prokaryotic cells?1.A) Ribosomes2.B) Endoplasmic reticulum3.C) Nucleus4.D) Mitochondria
Which of the following is found in botheukaryotic and prokaryotic cells?1. A)Ribosomes2.B) Endoplasmic reticulum3.C) Nucleus4.D) Mitochondria
Ch 15- Prokaryotes and the originof life
3 Domains of life, 4 kingdoms of eukaryotesDomain BacteriaUnicellular prokaryotesCause diseasesAre UbiquitousDomain Archaea“The ancient ones”Unicellular prokaryotesOften ExtremophilesLittle studied, little discussedDomain EukaryaPlantsAnimalsFungiProtists
Cells can be placed into two categoriesProkaryotic andeukaryoticProkaryotic- smaller andsimpler (bacteria andarchaea)Eukaryotic-larger andmore complex (eukarya

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Term
Fall
Professor
JenniferKlenz

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