By Mary Jones
A brand new source for the 2008 OCR specification supplying supportive gains and elevated flexibility in educating OCR a degree technology. The depended on selection for the 2008 OCR Specification. Biology 1 truly 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 filled with e-learning actions. The publication comes with an interactive PDF CD-ROM that offers additional details for speedy development for students requiring it, with no making a heavy and intimidating publication. The CD-ROM hyperlinks to a loose web site jam-packed with e-learning actions, selling autonomous and extension studying.
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Additional resources for Biology 1 for Ocr (Cambridge Ocr Advanced Science)
Its loss means that the whole of the space in the cell is available for manoeuvring the chromosomes. By the time the nuclear membrane breaks down, many of the microtubules have attached themselves to the centromeres of the chromosomes. Each centromere is grabbed by one microtubule on either side. 5). 4 Prophase. 5 Metaphase. 37 Chapter 3: Cell division and cellular organisation Anaphase Now the centromeres split. 6). 8). This forms two new cells, each with a nucleus containing a complete set of chromosomes, and each with a centriole.
Multilobed nucleus There is no nucleus, to make more room for haemoglobin. The cytoplasm contains small granules. Some of these granules are lysosomes which contain enzymes for digesting bacteria, whilst others are glycogen stores. 12 Neutrophils. plasma membrane, containing receptors that bind with the egg cell membrane to allow fertilisation to take place acrosome – a specialised lysosome, containing hydrolytic enzymes that digest a way into the egg cell so that fertilisation can occur The biconcave shape provides a relatively large surface area : volume ratio, which increases the amount of oxygen and carbon dioxide that can pass into and out of the cell in a certain period of time.
A system is a collection of organs with particular functions, such as the excretory, reproductive, cardiovascular and digestive systems in humans. 17 shows the tissues in a leaf. • • upper epidermis – thin transparent layer allowing light to reach mesophyll; protective; covered with a waterproof cuticle to reduce loss of water vascular bundle of midrib containing vascular tissue (xylem and phloem) phloem – transport of organic solutes, particularly sugar, made by photosynthesis xylem – transport of water and minerals palisade mesophyll – parenchyma cells containing chloroplasts for photosynthesis spongy mesophyll – large air spaces for circulation of carbon dioxide for photosynthesis; chloroplasts in cells for photosynthesis Together, palisade and spongy mesophyll form a tissue called chlorenchyma.
Biology 1 for Ocr (Cambridge Ocr Advanced Science) by Mary Jones