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Cell Structure

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Cell Structure Difference between resolution and magnification Magnification Resolution Magnification is the factor by which an image is enlarged. Resolution is the smallest distance that can be between two objects so that they still appear distinctly separate in the microscope picture. Determined by the size and magnitude of the lenses used Determind by the wavelength of light Difference between light microscope and electron microscope Light Microscope Electron microscope Uses light source focused by transparent lenses Uses electrons focused by magnetic lenses Lower resolution(usually 0.2 micrometer) Higher resolution(usually 2 nanometer) Allows study of living cells Doesn't allow study of living cells Specimens are stained with colourful dyes such as iodine Specimens are stained with heavy metal ions such as lead Specimens can be relatively thick Specimens are to be ...read more.


has some genes; theorized to be engulfed by the ancestral eukaryotic cell (endosymbiosis) endoplasmic reticulum * (RER)translation and folding of new proteins to form lysosomes Passed into cisternae which carry it to golgi body * (SER)synthesis of lipids, such as cholesterol and steroid hormones Breaking down of toxins Network of membranes Enclose spaces called cisternae which form an interconnecting channel throughout the cytoplasm all eukaryotes rough endoplasmic reticulum is covered with ribosomes, has folds that are flat sacs; smooth endoplasmic reticulum has folds that are tubular Golgi apparatus * sorting and modification of proteins(eg. Addition of carbohydrate to form glycoprotein) * Export of finalized protein through the cell membrane * Assembly of polysaccharides Stack of curved cisternae Smaller vesicles entering and leaving all eukaryotes cis-face (convex) ...read more.


for protein synthesis * translation of RNA into proteins RNA-protein Sometimes attached to the membrane of RER Clusters called polyribosomes eukaryotes, prokaryotes Sometimes found inside mitochondria and chloroplasts Centriole * The main function of centrioles is to produce the cell's cytoskeleton 2 short bundles of microtubule positioned perpendicularly Cytoskeleton * Provide internal framework for support * Organise and move organelles * Move the entire cell * Construct the spindle during cell division * Provide components of cilia and flagella * Complex network of fibrous protein * made up of microtubules and microfilaments that allow the movement for all kinds of things in the cell, including the chromosomes during mitosis and meiosis. Microtubules- Provide the basis of the supporting scaffolding of the cell mIcrofilament- linked to cell movement and transport ...read more.

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Response to the question

Good overall analysis of cell anatomy. No introduction or conclusion, but this is not needed for this factual rather than investigative piece of coursework. Main body of text is good, although a greater range of organelles could be examined. Response ...

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Response to the question

Good overall analysis of cell anatomy. No introduction or conclusion, but this is not needed for this factual rather than investigative piece of coursework. Main body of text is good, although a greater range of organelles could be examined. Response to the question is clear and concise, presented in tables to clearly tabulate differences between organelles and the different components of resolution and magnification and light and electron microscopy.

Level of analysis

Analysis of the differences between resolution and magnification is correct but this is not the main focus of this essay neither is pure cell structure, rather the main focus is a few different things, such as the structure of cells, the difference between resolution and magnification and the difference between light and electron microscopy. Could have included how to work out resolution and microscopy and perhaps the different levels of microscopy. There are also different types of electron microscopy that are used, and this could be examined in the differences between electron and light microscopy. Good descriptions of the different types of organelles, could include more components such as the nucleolus, the cell wall and cell membrane composition, and perhaps exo and endocytosis. Could also give examples of one or two different types of mammalian and plant cell and how they differ in their structure and relate this to function.

Quality of writing

Punctuation okay but inconsistent use of full stops. Spelling good for the most part but 'determined' is spelt incorrectly. Grammar is good.

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Reviewed by skatealexia 07/03/2012

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