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The Chemistry of Life Ch. 4.1-4.3.

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Presentation on theme: "The Chemistry of Life Ch. 4.1-4.3."— Presentation transcript:

1 The Chemistry of Life Ch

2 Recall: Levels of Organization

3 Biology Depends on Chemistry
In our biosphere, everything is made of atoms Through the interaction of chemicals we can better understand our biosphere

4 Atoms Basic unit of matter Protons Neutrons Electrons (+) charge
In nucleus Neutrons (0) charge Electrons (-) charge Around nucleus at varying energy levels

5 Molecules 2 or more atoms held together by chemical bonds
Importance to biology: macromolecules make up cells and cellular components

6 Chemical Bonds: Ionic Electrons transferred from one atom to another
Ex: NaCl (salt) Importance to biology: many salts are made this way (homeostatic balance)

7 Chemical Bonds: Covalent
Electrons are shared between atoms Ex: CO2 Importance to biology: carbon compounds, water

8 Chemical Bonds: Hydrogen
Weak bond formed from by the attraction of two electronegative molecules Slightly positive, slightly negative ends Importance to biology: critical to water’s properties, holds DNA together

9 Chemical Reactions Synthesis Decomposition
Make a compound Ex: Photosynthesis Decomposition Break down a compound Ex: Cellular Respiration Both reactions important to biology: metabolism

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