By Mary Jones
A brand new source for the 2008 OCR specification offering supportive positive factors and elevated flexibility in instructing OCR a degree technological know-how. The depended on selection for the 2008 OCR Specification. Biology 1 sincerely explains suggestions and is supported by way of a CD-ROM behind the books that offers additional info and hyperlinks to a loose web site jam-packed with e-learning actions. The booklet comes with an interactive PDF CD-ROM that offers additional info for swift development for students requiring it, with out making a heavy and intimidating e-book. The CD-ROM hyperlinks to a unfastened web site packed with e-learning actions, selling autonomous and extension studying.
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Additional info for Biology 1 for Ocr (Cambridge Ocr Advanced Science)
Prostaglandins are made in cells in practically all the tissues in the body, especially after injury. They pass out of the cell and slot into receptors in the membranes of several different kinds of cells, activating G-proteins and bringing about various effects in those cells. For example, some nerve cells respond to prostaglandins by sending pain signals to the brain. Prostaglandins also cause inflammation, where blood capillaries become leaky and allow fluid and white blood cells into the damaged area.
Membranes provide attachment sites for enzymes and other molecules involved in metabolism. The inner membrane of a mitochondrion contains molecules needed for the production of ATP. The inner membrane of a chloroplast contains chlorophyll needed for photosynthesis. 1 Functions of membranes. 24 Chapter 2: Cell membranes Structure of cell membranes All cell membranes have a similar structure. They are normally between 7 nm and 10 nm thick, which makes them invisible with a light microscope but visible using an electron microscope.
The hydrophilic heads of phospholipid molecules are therefore drawn to these fluids, while the hydrophobic tails are repelled by them. This causes the phospholipids to arrange themselves in a double layer, with heads facing outwards and tails facing inwards. 3). 3 A phospholipid bilayer. 2 Phospholipid molecules. Membranes also contain another type of lipid. This is cholesterol. Cholesterol molecules lie alongside the phospholipids, helping to make up the bilayer. There are also many different protein molecules in cell membranes.
Biology 1 for Ocr (Cambridge Ocr Advanced Science) by Mary Jones