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10ġ1 Evolution of Tolerance to Toxic Elements 5Ħ Sodium Chlorine Sodium chloride Figure 2.2įigure 2.2 The emergent properties of a compound Sodium Chlorine Sodium chloride 6ħ Figure 2.2a Figure 2.2a The emergent properties of a compound (part 1: sodium) Sodium 7Ĩ Figure 2.2b Figure 2.2b The emergent properties of a compound (part 2: chloride) Chlorine 8įigure 2.2c The emergent properties of a compound (part 3: sodium chloride) Sodium chloride 9ġ0 The Elements of Life Of 92 natural elements, about 20–25% are essential elements, needed by an organism to live a healthy life and reproduce Trace elements are required in only minute quantities For example, in vertebrates, iodine (I) is required for normal activity of the thyroid gland In humans, an iodine deficiency can cause goiter © 2014 Pearson Education, Inc.
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Matter is made up of elements An element is a substance that cannot be broken down to other substances by chemical reactions A compound is a substance consisting of two or more elements in a fixed ratio A compound has emergent properties, characteristics different from those of its elements © 2014 Pearson Education, Inc. Organisms are composed of matter Matter is anything that takes up space and has mass © 2014 Pearson Education, Inc. 2ģ Figure 2.1 Figure 2.1 What is this bombardier beetle doing? 3Ĥ Concept 2.1: Matter consists of chemical elements in pure form and in combinations called compounds Presentation on theme: "The Chemical Context of Life"- Presentation transcript:Ģ Overview: A Chemical Connection to Biologyīiology is a multidisciplinary science Living organisms are subject to basic laws of physics and chemistry © 2014 Pearson Education, Inc.