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Cell biology

Intro to Cells

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Bio 230: Cell Bio Intro to Cells: pg 1-26 Properties that define living organisms: Ability to reproduce on their own Viruses? Not living organisms but incapable of reproducing on their own Can grow and develop Require energy - metabolism Response to the environment Maintain homeostasis Contains genetic information (DNA or RNA) Composed of cells Cells are the fundamental unit of life. Invention of the light microscope led to the discovery of cells Robert Hooke Shortened telescope Many flaws, difficult to see Oil lamp with flask of water to illuminate specimen Examined cork - coined term cell Remains of cell walls after death Theodore Schwann All different species of animals were composed of cells Mathias Schleiden All different species of plants were composed of cells

Unit 1 Biology Review

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An Overview of Eucaryotic Cell Structure Eucaryotic cells have membrane-delimited nuclei In addition to the nucleus, eucaryotic cells have other membrane-bound organelles that perform specific functions within the cells; this allows simultaneous independent control The large membrane surface area of eucaryotic cells allows greater respiratory and photosynthetic activity The Cytoplasmic Matrix, Microfilaments, Intermediate Filaments, and Microtubules The cytoplasmic matrix, although superficially featureless, provides the complex environment required for many cellular activities Microfilaments (4 to 7 nm) may be scattered throughout the matrix or organized into networks and parallel arrays; they play a major role in cell motion and cell shape changes

Chapter 27: Bacteria and Archaea (9th Edition)

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CAMPBELL BIOLOGY, AP* 9th EDITION Chapter 27: Bacteria and Archaea 27.1 first organisms were likely prokaryotes unicellular variety of shapes - spherical, rod-shaped, and spiral well-organized the cell wall keeps it from bursting in a hypotonic solution and supports structure in hypertonic solutions, they shrink away from walls/plasmolyze contain peptidoglycan - polymer made of modified sugars crosslinked by short polypeptides. Archaea lack peptidoglycan but bacteria have it. Using the a technique called the Gram stain, scientists classify bacterial species into two ?groups based on cell wall composition Gram positive - simpler walls and a large amount of peptidoglycan Gram negative - less peptidoglycan and more structurally complex. Has an outer lipopolysaccharide membrane

Chapter 11

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Local/paracrine signaling: In paracrine signaling a signaling cells releases messenger molecules into the extracellular fluid and these local regulators influence nearby cells. Long distance signaling: Hormones are chemical signals that travel to more distant cells. Long distance signaling is going to be seen the most in the nervous system. There are 3 stages of cell signaling... 1. Reception 2. Transmission 3. Response RECEPTION There are three basic types of membrane receptors:

Chapter 12 Notes

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Biology 240 SI Session #10 Chapter 12 SI Leader: Lauren Curtis Email: [email protected] Prokaryotes: Describe the process of 'binary fission' : Binary fission is the process by which a prokaryotic cell cell reproduces asexually by dividing in half. This does not include mitosis in prokaryotes, but a process all in it's own. The cell duplicates it's DNA, doubling in size, and then splits into two daughter cells. Here are some terms you need to be familiar with in regards to cell division... Chromatin: A DNA-protein complex, represents DNA in it's unfolded and non condensed form. Chromosomes: Represents DNA folded and condensed down as the cell gets ready to divide. It organizes the DNA in a way where parts won't get lost when the cell splits in half.

AP Bio Campbell 8e

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Chapter 11 Cell Communication Overview: The Cellular Internet Cell-to-cell communication is essential for multicellular organisms Biologists have discovered some universal mechanisms of cellular regulation The combined effects of multiple signals determine cell response The dilation of blood vessels is controlled by multiple molecules Concept 11.1: External signals are converted to responses within the cell Microbes are a window on the role of cell signaling in the evolution of life Evolution of Cell Signaling A signal transduction pathway is a series of steps by which a signal on a cell?s surface is converted into a specific cellular response Signal transduction pathways convert signals on a cell?s surface into cellular responses

Taxonomy

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REVIEW OUTLINE ? TEST 2 CELLS/TAXONOMY CELL TYPES DOMAIN CRITERIA THE 6 KINGDOMS ? CHARACTERISTICS OF EACH THE MAJOR PHYLA CHORDATA VERTEBRATA ? MAMMALS, REPTILES, BIRDS, AMPHIBIANS, FISH HUMAN LINEAGE WE?RE UNIQUE AT WHAT POINT AND WHY? OPARIN-HALDANE MODEL ? PRIMITIVE ATMOSPHERE MILLER-UREY EXPERIMENT ? DETAILS OF SET-UP RESULTS ? WHAT DID THEY FIND? WHAT DIDN?T THEY FIND? CELL STRUCTURES CELL WALLS ? WHICH ONES? PLASMA MEMBRANE STRUCTURE ? DRAW IT! LABEL IT! TRANSPORT MECHANISMS PASSIVE ACTIVE ? DIAGRAMS ARE IMPORTANT TONICITY ENDOMEMBRANE SYSTEM OTHER ORGANELLES GOLGI ENDOPLASMIC RETICULUM (ER) ROUGH AND SMOOTH CYTOSKELETON DIFFERENCES IN ?FIBERS? NUCLEUS DOUBLE MEMBRANE ? WHY? PORES ENDOSYMBIOSIS

AP Biology Campbell 8th edition Chapter 12 Study Guide

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STUDY GUIDE: CH. 12 THE CELL CYCLE THE KEY ROLES OF CELL DIVISION 1. Explain how cell division functions in reproduction, growth, and repair. -Single-celled and other organisms reproduce asexually by cell division -Asexual spores, binary fissiion in bact., growth, breakage, and estab. Of vines -Growth may increase the sizes or numbers of cells -Wounding releases growth factors that stimulate mitosis 2. Describe the structural organization of the genome. -Organisms may have hundreds to tens of thousands of genes -Genes, controlling sequences, spacers, and junk are strung on chromosomes -Chromosome numbers -Bacteria may have one or a few circular or linear chromosomes -Eukaryotes may have one to >1000 linear chromosomes

Plants

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Chapter 1: Principles of Life Concept 1.1: Living Organisms Share Common Aspects of Structure, Function and Energy Flow Biology is the scientific study of living things All living things have a single common ancestor Life as we know it had a single origin All organisms: All organisms are composed of cells and organic material (amino acids, nucleic acids etc.) Contain genetic information for protein synthesis and reproduction Convert environmental molecules into biological molecules Use external energy for internal processes Maintain homeostasis Replicate DNA to prepare for reproduction Maintain similar genetic sequences in the fundamental set of genes Change their genetic information according to changes in environment (evolution)

Cell Division

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Cell Division Cell Division in Prokaryotes DNA is a circular chromosome attached to the inner surface of the plasma membrane like a rope attached to the inner wall of a tent Binary fission- Division of a prokaryotic cell into two offspring cells DNA is copied, two identical chromosomes attach to the inside of the prokaryote?s inner cell membrane A new cell membrane begins to develop between the two DNA copies As new material is added, the growing cell membrane pushes inward and the cell is constricted in the center A new cell wall forms around the new membrane and the prokaryote is split into two Each cell contains one of the identical chromosomes that resulted from the copying of the original cell?s chromosomes Cell Division in Eukaryotes

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