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Cell Structure IGCSE Biology 4 Mitochondria and Ribosomes Some cell structures are too small to be seen with the light microscope. Ribosomes are like this. They are found in the cytoplasm or attached to structures called endoplasmic reticulum and are the site of protein synthesis.
Cytoplasm The cytoplasm in prokaryotic cells doesn’t have membrane-bound organelles. It does contain ribosomes and they are smaller than those in a eukaryotic cell. Plasma membrane This membrane is made mostly from lipids and proteins - just like a eukaryotic cell. It controls movement of substances into and out of the cell. DNA (nucleoid)
The representation of cell structure as seen under the light microscope using drawings and annotated diagrams of whole cells or cells in sections of tissue. the use and manipulation of the magnification formula. The difference between magnification and resolution.
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Describe what cells, tissues, organs and organ systems are. Give named examples of cells, tissues, organs and organ systems in an organism. Explain what the different levels of organisation in an organism are.
Cytoplasm: The gel like substance inside a cell. Light microscope: Device that uses visible light and a series of lenses to produce an enlarged image of an object.
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Core: Relate the structure of the following to their functions – ciliated cells, root hair cells, xylem vessels, palisade mesophyll cells, nerve cells, red blood cells, sperm and egg cells. Define tissue as a group of cells with similar structures, working together to perform a shared function.
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Essential Guide to Reading Biomedical Papers: Recognising and Interpreting Best Practice, First Edition. Edited by Phil Langton. Electron Microscopy (TEM) or can look at the outer surface of a sample using Scanning Electron Microscopy (SEM), analogous to a stereo light microscope.
