Biology 1 for Ocr (Cambridge Ocr Advanced Science) by Mary Jones

By Mary Jones

A brand new source for the 2008 OCR specification supplying supportive good points and elevated flexibility in educating OCR a degree technological know-how. The relied on selection for the 2008 OCR Specification. Biology 1 essentially explains thoughts and is supported by way of a CD-ROM at the back of the books that gives additional info and hyperlinks to a loose site choked with e-learning actions. The e-book comes with an interactive PDF CD-ROM that offers additional details for quick development for scholars requiring it, with no making a heavy and intimidating publication. The CD-ROM hyperlinks to a unfastened web site filled with e-learning actions, selling self reliant and extension studying.

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Component A cell must stay in contact with its environment and with other cells in order to survive. Cells must be able to react to changes in their environment. In a multicellular organism, cells in one part of the body must be able to communicate with cells in other parts. A cell therefore needs to be able to pick up ‘signals’ at its surface to which it may need to respond. Signals arrive at the plasma membrane from outside the cell as particular substances – for example, a hormone – or changes in electrical potential – as happens in nerve impulses.

The oldest fossil sponges that have so far been discovered are 600 million years old, and it is likely that sponges were around for some time before then. Sponges are found in seas all over the world, and a few species live in fresh water. At first sight, sponges don’t look like animals at all. They remain apparently motionless, generally fixed permanently to the sea bed or a coral reef. Under the microscope, however, they can be seen to have cells with no cell walls – a feature typical of animal cells.

Phospholipid bilayer Phospholipid molecules have an unusual property. Their heads have a tiny charge, and this attracts them to water molecules. But their tails don’t have a charge, and they are repelled from water molecules. 2). The cytoplasm inside a cell contains a lot of water, and so does the fluid outside cells. ) 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.

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