By Mary Jones

A brand new source for the 2008 OCR specification supplying supportive gains and elevated flexibility in instructing OCR a degree technological know-how. The depended on selection for the 2008 OCR Specification. Biology 1 in actual fact explains options and is supported through a CD-ROM behind the books that gives additional details and hyperlinks to a loose site packed with e-learning actions. The publication comes with an interactive PDF CD-ROM that gives additional details for quick development for scholars requiring it, with out making a heavy and intimidating publication. The CD-ROM hyperlinks to a loose web site filled with e-learning actions, selling self sufficient and extension studying.

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Extra resources for Biology 1 for Ocr (Cambridge Ocr Advanced Science)

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SAQ 2 Suggest the functions of the ciliated epithelium in: a the bronchioles Answer b the oviducts. a squamous epithelial cell Coordination Division of labour within a multicellular organism means that every cell has its own set of functions in which it specialises. However, it is clearly essential that there is communication and cooperation between cells within a tissue, and between tissues, organs and systems in different parts of the body. Pulling the activities of all the different parts of the body together, so that they work with each other and do appropriate things at appropriate times, is essential if a multicellular organism is to survive.

A plant cell in a solution that is less concentrated than the cell solution absorbs water by osmosis 1 2 3 pressure of cell contents water in equals pressure of wall resisting uptake of water (pressure potential) pressure of cell contents Water diffuses into the cell through the partially permeable plasma membrane. The cell contents expand. The contents will push out on the wall. ψ outside The wall pushes back on the cell contents. The force of the wall pushing on the cell contents is called the pressure potential.

The cell becomes full and stiff, a state called turgor. If a plant cell is put into a concentrated solution, then water leaves it by osmosis. The cell therefore shrinks. If a lot of water is lost, the contents no longer press outwards on the cell wall, and the cell loses its turgor. It is said to be flaccid. The strong cell wall cannot cave in very much, so as the volume of the cell gets smaller and smaller, the plasma membrane may eventually pull away from the cell wall. The plasma membrane is often damaged in this process.

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