Introduction to pH.. We will soon learn how pH effects biological molecules but before we do that we need a basic understanding of pH. Chapter 2.3 in our textbook also explain pH and solutions.
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Keystone Standards for Chemistry of Life:

a.2.2.1. Explain how carbon is uniquely suited to form biological macromolecules
a.2.2.3. Compare the structure and function of carbohydrates, lipids, proteins, and nucleic acids in organisms
a.2.2.2. Describe how biological macromolecules form from monomers.

a.2.1.1 Describe the properties of water and how these properties support life on Earth.

Quick links to tutorials on macromolecules:


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Condensation/Hydrolysis explained

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Lipids Tutorial

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Proteins

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All about enzymes

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Carbohydrate Tutorial

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Cholesterol

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Lactose Lab-Virtual

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Enzymes as Catalyse

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Digestion Explained