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Cambridge International AS and A Level Biology Coursebook by Mary Jones

By Mary Jones

Absolutely revised and up to date content material matching the recent Cambridge foreign Examinations Biology 9700 syllabus for first instructing in 2014 and primary exam in 2016. counseled by means of Cambridge overseas Examinations, the Fourth version of the AS/A point Biology Coursebook comprehensively covers the entire wisdom and talents scholars want through the Biology 9700 direction (first exam 2016). Written via well known specialists in Biology instructing, the textual content is written in an obtainable kind with foreign inexperienced persons in brain. The Coursebook is straightforward to navigate with colour-coded sections to tell apart among AS and a degree content material. Self-assessment questions let rookies to trace their development and exam-style questions aid rookies to organize completely for his or her examinations. modern contexts are mentioned all through improving the relevance and curiosity for beginners.

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Extra info for Cambridge International AS and A Level Biology Coursebook with CD-ROM

Example text

This is due to the large number of carbon–hydrogen bonds. These bonds can be broken to release a lot of energy, which is transferred to help make ATP (adenosine triphosphate) from ADP (adenosine diphosphate) and phosphate. The most important monosaccharide in energy metabolism is glucose. Secondly, monosaccharides are important as building blocks for larger molecules. For example, glucose is used to make the polysaccharides starch, glycogen and cellulose. Ribose (a pentose) is one of the molecules used to make RNA (ribonucleic acid) and ATP.

The cell is very active, requiring a lot of energy. The arrows show the route taken by the protein molecules. A magnified E A C B D protein (enzyme) molecules i Describe briefly what is happening at each of the stages A, B, C and D. ii Name one molecule or structure which leaves the nucleus by route E. iii Through which structure must the molecule or structure you named in ii pass to get through the nuclear envelope? iv Name the molecule which leaves the mitochondrion in order to provide energy for this cell.

Each polypeptide chain contains a haem group, shown in yellow and red. b The haem group contains an iron atom, which can bond reversibly with an oxygen molecule. c The complete haemoglobin molecule is nearly spherical. Quaternary structure is the three-dimensional arrangement of two or more polypeptides, or of a polypeptide and a non-protein component such as haem, in a protein molecule. Chapter 2: Biological molecules Globular and fibrous proteins A protein whose molecules curl up into a ‘ball’ shape, such as myoglobin or haemoglobin, is known as a globular protein.

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