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Paper 2 style question on topic 1.1 Intro to cells
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<h3 id="header-1">Summary list for 1.1 Introduction to cells</h3>
<p><u>Cell theory</u></p>
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<li>According to cell theory, living organisms are composed of cells.</li>
<li>Organisms consisting of only one cell carry out all functions of life in that cell, e.g. <em>Paramecium, Chlorella</em>.</li>
<li>Identifying the characteristics of living things (Mr H. Gren - <strong>m</strong>etabolism,<strong> r</strong>esponse, <strong>h</strong>omeostasis, <strong>g</strong>rowth, <strong>r</strong>eproduction, <strong>e</strong>xcretion & <strong>n</strong>utrition).</li>
<li>Surface area to volume ratio is important in the limitation of cell size.</li>
<li>Multicellular organisms have properties that emerge from the interaction of their cellular components, (Emergent properties).</li>
<li>Specialised tissues can develop by cell differentiation in multicellular organisms.</li>
<li>Differentiation involves the expression of some genes and not others in a cell.</li>
<li>Stem cells can divide and differentiate along different pathways in embryonic development which makes stem cells useful for therapeutic uses (e.g. Stargardt's disease).</li>
<li>There are ethical concerns about the use of embryo stem cells.</li>
</ul>
<p><u>Calculating magnification and size</u></p>
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<li>Calculate the magnification of an electron microscope image from a scale bar.</li>
<li>Calculate specimen size using a scale bar.</li>
<li>Calculate specimen size using magnification.</li>
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