Cambridge International AS and A Level Biology Coursebook with CD-ROM : Mary Jones :In many proteins, the secondary structure itself is coiled or folded. Figure 2. At first sight, the myoglobin and lysozyme molecules look like disorganised tangles, but this is not so. The shape of the molecules is very precise, and the molecules are held in these exact shapes by bonds between amino acids in different parts of the chain. The way in which a protein coils up to form a precise three-dimensional shape is known as its tertiary structure. The R groups are not shown. Both of these structures are held in shape by hydrogen bonds between the amino acids.
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Mary Jones, Richard Fosbery,. Jennifer Gregory and Dennis Taylor. Cambridge International AS and A Level. Biology. Coursebook. Fourth Edition.
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Fully revised and updated content matching the new Cambridge International Examinations Biology syllabus for first teaching in and first examination in Written by renowned and leading experts in Biology teaching, the ebook is easy to navigate with colour-coded sections and clear signposting throughout. Self assessment questions allow learners to track their progression through the course and exam-style questions at the end of every chapter provide opportunity for learners to prepare thoroughly for their examinations. Contemporary contexts and applications are discussed throughout enhancing the relevance and interest for learners. Sign up to our newsletter today! Click here for more details
Subject to statutory exception and to the provisions of relevant collective licensing agreements, no reproduction of any part may take place without the written permission of Cambridge University Press. Cambridge University Press has no responsibility for the persistence or accuracy of URLs for external or third-party internet websites referred to in this publication, and does not guarantee that any content on such websites is, or will remain, accurate or appropriate. Contents Introduction 1 Cell structure Why cells? Cell biology and microscopy Animal and plant cells have features in common Differences between animal and plant cells Units of measurement in cell studies Electron microscopes Ultrastructure of an animal cell Structures and functions of organelles Ultrastructure of a plant cell Two fundamentally different types of cell Tissues and organs End-of-chapter questions. Phospholipids Structure of membranes Transport across the cell surface membrane End-of-chapter questions. Tobacco smoke Lung diseases Cardiovascular diseases Proving the links between smoking and lung disease Prevention and cure of coronary heart disease End-of-chapter questions.