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cell cycle

AP Bio Lab 7

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AP LAB 7: CELL DIVISION: MITOSIS AND MEIOSIS How do eukaryotic cells divide to produce genetically identical cells or to produce gametes with half the normal DNA? BACKGROUND One of the characteristics of living things is the ability to replicate and pass on genetic information to the next generation. Cell division in individual bacteria and archaea usually occurs by binary fission. Mitochondria and chloroplasts also replicate by binary fission, which is evidence of the evolutionary relationship between these organelles and prokaryotes. Cell division in eukaryotes is more complex. It requires the cell to manage a complicated process of duplicating the nucleus, other organelles, and multiple chromosomes. This process, called the cell cycle, is divided

Ch. 12 Quick Notes

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THE CELL CYCLE-Chapter 12 ? Ability to reproduce = one characteristic of living things ? Continuity of life based on the reproduction of cells ? Cell division functions in reproduction, growth, and repair? UNICELLULAR ORGANISMS use cell division for reproduction? MULTICELLULAR ORGANISMS use cell division to:? -repair/renew cells that die from normal wear and tear? -grow and develop from a single fertilized egg (zygote)? -reproduce asexually (EX: plants grow by cuttings) ? Results in genetically identical daughter cells ? DNA molecules packaged into chromosomes ? GENOME= cell?s genetic information Prokaryotes genome - single circular loop of DNA Eukaryotes - several DNA molecules in multiple chromosome bundles

Regulation of the cell cycle

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Cell Cycle Regulation Cell cycle control systems The frequency of cell division varies with the type of cell Caused by the difference in regulation at the molecular level The stages of the cell cycle are regulated by a distinct cell cycle control system (similar to a clock) The cell cycle control system is regulated by both internal and external controls The clock has specific checkpoints where the cell cycle stops until a go-ahead signal is received Cell cycle control systems: interphase and mitosis Interphase Makes up about 90% of the cell cycle: can be divided into subphases: G1 phase (?first gap?) S phase (?synthesis?) G2 phase (?second gap?) The cell grows during all three phases Chromosomes are only duplicated during the S phase

Cell Cycle

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Chapter 12: The Cell Cycle Overview: The Key Roles of Cell Division the continuity of life is based upon the reproduction of cells, or cell division unicellular organisms reproduce by cell division multicellular organisms depend on cell division for development (from a fertilized cell), growth and repair the cell division process is an integral part of the cell cycle, the life of a cell from its formation from the division of the parent cell to its own division Concept 12.1: Cell division results in two identical daughter cells cells duplicate their genetic material before they divide, ensuring that each daughter cell receives an exact copy of genetic material, DNA Cellular Organization of the Genetic Material a cell?s endowment of DNA, its genetic information, is called its genome

Campbell Biology Chapter 12 Outline

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Mica Piro Chapter 12: The Cell Cycle Most Cell Division Results in Genetically Identical Daughter Cells (12.1) Cellular Organization of the Genetic Material A cell?s endowment of DNA, its genetic information, is called its genome A prokaryotic genome is often a single DNA molecule Eukaryotic genomes usually consist of a number of DNA molecules All of this DNA has to be copied, or replicated, before the cell can divide to form genetically identical daughter cells, and then the 2 copies must be separated so that each daughter cell ends up with a complete genome The replication and distribution of so much DNA is manageable because the DNA molecules are packaged into structures called chromosomes, because they take up certain dyes used in microscopy

AP Biology Chapter 12 Reading Guide

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AP Biology Name _________________________ Chapter 12 Guided Reading Compare and contrast the role of cell division in unicellular and multicellular organisms. ??? Define the following terms: Genome? Chromosomes? Somatic cells? Gametes? Chromatin? Sister chromatids? Centromere? Mitosis? Cytokinesis? Meiosis? List the activities of the cell cycle: Mitotic phase? Interphase? G1 phase? G2 phase? S phase? Define the following terms: Mitotic spindle? Centrosome? Microtubule organizing center? Aster? Kinetochore? Label below:?? Label the diagram below (phases, structures, etc):?????????????? Contrast cytokinesis in plant and animal cells.??? Define binary fission and label the diagram below:?????? Discuss the hypothetical evolution of mitosis.?????

AP Bio Review

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AP BIOLOGY SEMESTER 2 REVIEW UNIT 7 CONTINUED: ANIMAL FORM & FUNCTION Cell Communication Reception ? signal molecule binds to receptor protein in cell membranes causing it to change shape G protein coupled receptor Transduction = cascade of molecules activates relaying signal within cell Signal transduction pathway (ex. G-protein, tyrosine-kinase receptors, ion channel receptors) Phosphorylation cascades Secondary messenger system (ex. Cyclic AMP, Ca2+ ions, DAG, IP3) Response Transcription factors turn genes on or off Cellular activity activate enzymes, open cell membrane channels, apoptosis Scaffolding proteins Endocrine System (table page 961) Homeostasis Blood sugar regulation, blood calcium regulation Negative feedback, positive feedback Neurosecretory cells

AP Bio Review

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AP BIOLOGY SEMESTER 2 REVIEW UNIT 7 CONTINUED: ANIMAL FORM & FUNCTION Cell Communication Reception ? signal molecule binds to receptor protein in cell membranes causing it to change shape G protein coupled receptor Transduction = cascade of molecules activates relaying signal within cell Signal transduction pathway (ex. G-protein, tyrosine-kinase receptors, ion channel receptors) Phosphorylation cascades Secondary messenger system (ex. Cyclic AMP, Ca2+ ions, DAG, IP3) Response Transcription factors turn genes on or off Cellular activity activate enzymes, open cell membrane channels, apoptosis Scaffolding proteins Endocrine System (table page 961) Homeostasis Blood sugar regulation, blood calcium regulation Negative feedback, positive feedback Neurosecretory cells

Campbell AP Biology Study Guide Ch 12

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Campbell's Biology, 9e (Reece et al.) Chapter 12 The Cell Cycle In this chapter, 24 questions are new, and 12 have been altered to incorporate new material from the textbook. As in the other chapters, any questions that depend on figures or introductory scenarios have been placed at the end of the chapter rather than in concept sequence. Multiple-Choice Questions 1) The centromere is a region in which A) chromatids remain attached to one another until anaphase. B) metaphase chromosomes become aligned at the metaphase plate. C) chromosomes are grouped during telophase. D) the nucleus is located prior to mitosis. E) new spindle microtubules form at either end. Answer: A Topic: Concept 12.1 Skill: Knowledge/Comprehension

chapter 12 note

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Chapter 12 The Cell Cycle and Mitosis The Key Roles of Cell Division Cell division functions in reproduction, growth, and repair Unicellular organisms (ex. Amoeba) will divide to reproduce entire organisms Cell division also will allows a multicellular organism to develop from a single cell The Key Roles of Cell Division DNA is passed from one generation of cells to the next without dilution. -cell duplicates it DNA - moves the 2 copies to opposite ends of the cell - and then splits into 2 daughter cells The Key Roles of Cell Division Concept 12.1 Cell Division distributes identical sets of chromosomes to daughter cells A cell?s genetic material is called its genome - prokaryote = single long DNA strand - eukaryote = number of DNA molecules Concept 12.1

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