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Organic Chemistry. Carbon-based molecules – What we are made of!. Learning Focus. Describe the structure of important biochemical compound – carbohydrates, protein, lipids, and nucleic acids and explain their function within the cells
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Organic Chemistry Carbon-based molecules – What we are made of!
Learning Focus • Describe the structure of important biochemical compound – carbohydrates, protein, lipids, and nucleic acids and explain their function within the cells • Identify common functional groups within biological molecules, and explain their contributions to the function of each molecule. • Identify and describe the main types of biochemical reactions: acid-base, oxidation-reduction, hydrolysis, and condensation • Draw 3D molecular models of important biochemical compounds.
Carbon – Central Element of Life • Backbone of all organic molecules • Carbon forms four chemical bonds: Source: http://en.wikipedia.org/wiki/Image:Methane-2D-stereo.svg Source: http://upload.wikimedia.org/wikipedia/commons/5/55/Ch4-structure.png
The Role of Carbon • Backbone of all organic molecules • Can form long chains, ring structures, and complex 3D shapes Source: http://en.wikipedia.org/wiki/Image:Maitotoxin.png
The Role of Carbon • Carbon’s bonds can be single, double or triple Source: http://en.wikipedia.org/wiki/Image:Ethane-2D.png Source: http://en.wikipedia.org/wiki/Image:Ethene_structural.svg Source: http://en.wikipedia.org/wiki/Image:Acetylene-2D.png • Which bond do you think takes more energy to break?
Types of Organic Molecules • Organic compounds with only Hydrogen and Carbon are called Hydrocarbons • Hydrocarbon types: • Alkanes (single bonds) • Alkenes (double bonds) • Alkynes (triple bonds) • Hydrocarbon = non-polar covalent • Other organic compounds are classified by their functional group Acetylene
Functional groups • A group of atoms within an organic compound that give the compound it’s characteristic chemical and physical properties is called a functional group • Functional groups are where much of the bonding i.e. reactions) takes place in biological molecules. • They are attached to the carbonbackbone of organic molecules Source: http://en.wikipedia.org/wiki/File:FG-vs-moiety.png
Skeletal Organic Molecules • Illustrations that “assume” hydrogen Example:
Practice Questions • Identify the circled functional groups
Read pg. 26 on bonding capacity • Pg 27 – Understanding concepts - Practice • Bonding capacity – Tip • One way to remember the bonding capacity of the most 4 common elements in order is through the acronym HONC (pronounced “HONK”). • H = 1, O = 2, N = 3, C = 4