Lecture_class_twenty

Lecture_class_twenty - Lecture twenty Chapter nine I....

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1 Lecture twenty Chapter nine I. Basics of Cell Division II. The Cell Cycle (~preparation for cell division. .sort of) III. DNA/proteins and Microtubules in Mitosis (nuclear division) IV. Phases in Mitoses
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2 I. Cell Division Four events must occur for any cell division: Reproductive Signal : to initiate cell division Replication : of DNA Segregation : distribution of the DNA into the two new cells (other material, like organelles etc not so) Cytokinesis : separation of the two new cells
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3 Duration of cell cycle differs for different organisms: -fastest fly 8 min. -slowest liver cells x> 1 year Typically for a mammalian cell: 24 hours (this is considered rapid for us)
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4 A. Prokaryotes Reproductive signals Environmental (food stuff and climate) Replication of DNA (circular DNA; one chromosome) Segregation of DNA: At “ori” site proteins using “ATP” help “polarize” (i.e separate the DNA) Cytokinesis: Begins after DNA division and the “pinching” in of the plasma membrane Review: These consist of bacteria and cynobacteria. They have no real organelles (e.g. nucleus) and most have a cell wall.
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5 Replication Segregation of DNA and cytokinesis
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6 B. Eukaryotes Complex eukaryotes originate from the union of “gametes” containing genetic material from both parents to form a “single” cell fertilized egg. Development ( reproduction and cell specialization ) is the formation of a multicellular organism from a fertilized egg. (e.g. fertilized egg to adult) Development Prokaryotes reproduction specialization
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This note was uploaded on 03/29/2008 for the course CEM 251 taught by Professor Rathke during the Spring '07 term at Michigan State University.

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Lecture_class_twenty - Lecture twenty Chapter nine I....

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