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  • Biological Cell Introduction - Biology Online
    information that determines every natural process within an organism Cell Membrane Also known as a plasma membrane this outer layer of a cell assists in the movement of molecules in and out the cell plays both a structural and protective role Lysosomes Membranous sacs that contain digestive enzymes Cell Wall A structure that characteristically is found in plants and prokaryotes and not animals that plays a structural and protective role Cell Specialisation Cells can become specialised to perform a particular function within an organism usually as part of a larger tissue consisting of many of the same cells working in tandem for example Nerve cells to operate as part of the nervous system to send messages back and forth via the brain at the centre of the nerve system Skin cells for waterproof protection and protection against pathogens in the open air environment Xylem tubes to transport water around plants and to provide structural support for the plant as a whole Cells combine their efforts in these tissue types to perform a common cause The task of the specialised cell will determine in what way it is going to be specialised because different cells are suited to different purposes as illustrated in the above list and below example Muscle cells are long and smooth in structure and their elastic nature allows these cells to perform flexible movements just as they do in our own body s Some white blood cells contain powerful digestive enzymes to eliminate pathogens by breaking them down to the molecular level Cells at the back of the eye are sensitive to light stimuli and thus can interpret differences in light intensity which can in turn be interpreted by our nervous system and brain Many of these cells contain organelles though after some cells are specialised they do not possess particular characteristics as they do not require them to be there i e efficiency is the key no resources are wasted and the resources available are put to their idyllic optimum The Cell Membrane The cell membrane otherwise known as the plasma membrane is a semi permeable structure consisting mainly of phospholipid fat molecules and proteins They are structured in a fluid mosaic model where a double layer of phospholipid molecules provide a barrier accompanied by proteins It is present round the circumference of a cell to acts as a barrier keeping foreign entities out the cell and its contents like cytoplasm firmly inside the cell The plasma membrane allows only selected materials to pass in and out of a cell and is thus known as a selectively permeable membrane There are a number of methods that allow the exchange of materials in and out the cell possible mentioned below Cell Transport There are three methods in which ions are transported through the cell membrane into the cell Active Transport Active transport is the transport of molecules with the active assistance of a carrier that can transport the material against a natural concentration gradient Passive Transport Diffusion

    Original URL path: http://www.biology-online.org/1/1_cell.htm (2016-02-17)
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  • Biology Online
    Share your work Submit your Work Biology Online org is the World s No 1 free resource for biology related information run by enthusiasts from all around the world and visited by over 25 000 people every day Please help us grow our content Submit your own articles tutorials essays reports or any other biology related work and we will publish it online in the appropriate section Use the form

    Original URL path: http://www.biology-online.org/share_work.php?lp=%2Fbookcats%2Fbiology_books.html (2016-02-17)
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  • Miscellaneous - Biology Online
    Categories Careers in Biology 1 Bioethics 15 Miscellaneous Applied Groundwater Modeling Creating numerical groundwater models of field problems requires careful attention to describing the problem domain selecting boundary conditions assigning model parameters and calibrating the model Date 5 Feb 2007 Rating 2 5 Hydrology and Floodplain Analysis 3rd Edition Offers a clear and up to date presentation of fundamental concepts and design methods required to understand hydrology and floodplain analysis

    Original URL path: http://www.biology-online.org/bookcats/biology_books/miscellaneous.html (2016-02-17)
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  • Medicine - Biology Online
    Categories Pathology 7 Surgery 1 Physical Medicine 1 Internal Medicine 1 Alternative Medicine 3 Health Preventive Medicine 10 Medicine The Cure for All Diseases by H R Clark Excerpt from Spotlight Reviews Buy and READ this book if you want to get and stay well Date 20 Dec 2006 Rating 3 2 Emergency Medicine A Comprehensive Study Guide 6th Ed by J E Tintinalli et al The essential emergency medicine

    Original URL path: http://www.biology-online.org/bookcats/biology_books/medicine24.html (2016-02-17)
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  • Chemistry - Biology Online
    Biochemistry 16 Inorganic Chemistry 5 Analytical Chemistry 5 Chemistry Chemistry for Dummies See how chemistry works in everything from soaps to medicines to petroleum Includes examples of chemistry in action in everyday life Softcover Date 6 Aug 2007 Rating 3 0 Chemistry The Molecular Nature of Matter and Change Chemistry The Molecular Nature of Matter and Change by Martin Silberberg has become a favorite among faculty and students Date 6 Aug 2007 Rating 3 2 Chemistry Designed for the two semester general chemistry course Chang s best selling textbook continues to take a traditional approach and is often considered a student and teacher favorite Date 6 Aug 2007 Rating 3 4 Introductory Chemistry a Foundation Long known for its superior problem solving pedagogy and engaging narrative style the new edition of Introductory Chemistry A Foundation offers unparalleled instructor and student support Date 6 Aug 2007 Rating 5 0 Chemistry The Central Science 10th Edition Excerpt in Customer Reviews An excellent and understandable introduction to chemistry Date 6 Aug 2007 Rating 3 0 Chemistry and Life An Introduction to General Organic and Biological Chemistry 6th Edition Studies chemistry and life beginning with simple substances to provide a better understanding of the

    Original URL path: http://www.biology-online.org/bookcats/biology_books/chemistry.html (2016-02-17)
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  • Mathematics - Biology Online
    proportions rationalizing fractions multiplying and factoring expressions solving linear and quadratic equations etc Date 7 May 2007 Rating 2 7 Algebra for Dummies This easy to understand reference not only explains algebra in terms you can understand but it also gives you the necessary tools to solve complex problems Date 7 May 2007 Rating 2 8 The Ultimate Math Refresher for the GRE GMAT and SAT This math refresher workbook is designed to clearly and concisely state the basic math rules and principles of arithmetic algebra and geometry which a student needs to master Date 7 May 2007 Rating 4 0 The Visual Display of Quantitative Information 2nd edition A timeless classic in how complex information should be presented graphically Date 7 May 2007 Rating Not rated Math 76 An Incremental Development Excerpt from Customer Reviews We have used Saxon Math for years Date 21 Mar 2007 Rating 3 0 Math on Call A Mathematics Handbook Excerpt from Customer Reviews Absolutely Fantastic Date 21 Mar 2007 Rating 2 8 Mastering Essential Math Skills for grades 6 8 Veteran award winning teacher Richard fisher shares his proven system of teaching which motivates students to learn and produces dramatic results Date 21

    Original URL path: http://www.biology-online.org/bookcats/biology_books/mathematics.html (2016-02-17)
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  • Agriculture - Biology Online
    Articles Tutorials Books Directory Share your work Biology Books Agriculture Agriculture A collection of books on Agriculture which is the science art and business of cultivating the soil producing crops and raising livestock Sub Categories Aquaculture 1 Agronomy 5 Animal Culture 4 Forestry 1 Agriculture The Self sufficient Life and How to Live It The Self Sufficient Life and How to Live It is the only book that teaches all

    Original URL path: http://www.biology-online.org/bookcats/biology_books/agriculture.html (2016-02-17)
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  • General Biology - Biology Online
    finish Biology 101 Date 16 Oct 2006 Rating 2 6 Biology and Revolution in Twentieth Century China by L Schneider Using the field of genetics as a case study this book follows the troubled development of modern natural science in China from the 1920s through Mao s China to the present post socialist era Date 16 Oct 2006 Rating 3 0 Bioinquiry Making Connections in Biology 3rd Edition by N L Pruitt L S Underwood From its inception this NSF sponsored learning system was hailed as a welcome departure from traditional approaches both in terms of organization and delivery of content Date 16 Oct 2006 Rating 4 0 Exploring Creation With Biology by J L Wile M Durnell Excerpt from customer review The authur of this book admits he is biased in that he believes there is a God Date 16 Oct 2006 Rating 3 0 Biology Understanding Life by S Alters B Alters Designed for a one or two semester non majors course in introductory biology taught at most two and four year colleges Date 11 Oct 2006 Rating 3 2 Biology Inquiries Standards Based Labs Assessments and Discussion Lessons by M Shields Biology Inquiries offers educators a handbook for teaching middle and high school students engaging lessons in the life sciences Date 11 Oct 2006 Rating 3 7 Basic Concepts in Biology with CD ROM How Do I Prepare vMentor and BiologyNow InfoTrac Brooks Cole Biology BASIC CONCEPTS IN BIOLOGY supplies a 650 page introductory issues oriented approach with enormous instructional power Date 11 Oct 2006 Rating 2 8 Biology Today and Tomorrow by C Starr Cecie Starr is the most successful author in non majors biology because of her clear and engaging writing trend setting art and unparalleled student and instructor media Date 11 Oct 2006 Rating

    Original URL path: http://www.biology-online.org/bookcats/biology_books/general_biology.html (2016-02-17)
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